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{{Short description|American mathematician (1928–2015)}}
{{pp-blp|small=yes}}
{{Use mdy dates|date=May 2015}} {{Use mdy dates|date=November 2022}}
{{Infobox scientist {{Infobox scientist
|name = John Forbes Nash, Jr. | image = John Forbes Nash, Jr. by Peter Badge.jpg
|image = John f nash 20061102 3.jpg | caption = Nash in the 2000s
|image_size = 350px | birth_date = {{birth date|1928|6|13}}
| birth_place = ], U.S.
|caption = John Forbes Nash, Jr. at a symposium of game theory at the university of Cologne, Germany, 2nd Nov. 2006
|birth_date = {{Birth date|mf=yes|1928|06|13}} | death_date = {{death date and age|2015|5|23|1928|6|13}}
|birth_place = ], U.S. | death_place = ], U.S.
|death_date = {{Death date and age|mf=yes|2015|05|23|1928|06|13}} | fields = {{plainlist|
* Mathematics
|death_place = ], ], U.S.
* ]
|residence = United States
* Economics}}
|nationality = American
|fields = {{plainlist| | workplaces = {{plainlist|
* ]
* ]
}}
|workplaces = {{plainlist|
* ] * ]
* ] * ]}}
| education = {{plainlist|
}}
* ] (], ])
|alma_mater = {{plainlist|
* Princeton University * ] (PhD)}}
| thesis_title = Non-Cooperative Games
* ] (now part of ])
| thesis_url = https://www.princeton.edu/mudd/news/faq/topics/Non-Cooperative_Games_Nash.pdf
}}
| thesis_year = 1950
|doctoral_advisor = ]
| doctoral_advisor = ]
|doctoral_students =
|known_for = {{plainlist| | known_for = {{plainlist|
* ]
* ]
* ] * ]
* ] * ]
* ] * ]
* ]
* ]
* ] * ]
* ]
}}
* Ideal money}}
|awards = {{plainlist|
| awards = {{plainlist|
* ] (1978) * ] (1978)
* ] (1994) * ] (1994)
* ] (1996)
* ] (2015)
* ] (2015)}}
}}
|spouse = Alicia Lopez-Harrison de Lardé <small>(m. 1957–1963) (divorced); (m. 2001–2015) (their deaths)</small> | spouse = {{ubl|{{marriage|]|1957|1963|end=div}}|{{marriage||2001|2015|end=their deaths}}}}
|children = 2 | children = 2
}} }}
'''John Forbes Nash, Jr.''' (June 13, 1928&nbsp;– May 23, 2015), known and published as '''John Nash''', was an American mathematician who made fundamental contributions to ], ], ], and ]s.<ref>{{cite news |author=Goode, Erica |title=John F. Nash Jr., Math Genius Defined by a 'Beautiful Mind,' Dies at 86 |url=https://www.nytimes.com/2015/05/25/science/john-nash-a-beautiful-mind-subject-and-nobel-winner-dies-at-86.html |newspaper=] |date=May 24, 2015}}</ref><ref>{{cite web |title=John F. Nash Jr. and Louis Nirenberg share the Abel Prize |url=http://www.abelprize.no/nyheter/vis.html?tid=63589 |publisher=] |date=March 25, 2015 |access-date=May 27, 2015 |archive-date=June 16, 2019 |archive-url=https://web.archive.org/web/20190616214625/https://www.abelprize.no/nyheter/vis.html?tid=63589 }}</ref> Nash and fellow game theorists ] and ] were awarded the 1994 ]. In 2015, he and ] were awarded the ] for their contributions to the field of partial differential equations.


As a graduate student in the ], Nash introduced a number of concepts (including ] and the ]) which are now considered central to game theory and its applications in various sciences. In the 1950s, Nash discovered and proved the ] by solving a system of nonlinear partial differential equations arising in ]. This work, also introducing a preliminary form of the ], was later recognized by the ] with the ]. ] and Nash found, with separate methods, a body of results paving the way for a systematic understanding of ] and ]s. Their De Giorgi–Nash theorem on the smoothness of solutions of such equations resolved ] on regularity in the ], which had been a well-known ] for almost sixty years.
'''John Forbes Nash, Jr.''' (June 13, 1928&nbsp;– May 23, 2015) was an American ] whose works in ], ], and ]s have provided insight into the factors that govern chance and events inside complex systems in daily life.


In 1959, Nash began showing clear signs of mental illness, and spent several years at ]s being treated for ]. After 1970, his condition slowly improved, allowing him to return to academic work by the mid-1980s.<ref name="Nasar1994" />
His theories are used in ], computing, ], ], accounting, politics and ]. Serving as a Senior Research Mathematician at ] during the latter part of his life, he shared the 1994 ] with game theorists ] and ]. In 2015, he was awarded the ] (along with ]) for his work on ] partial differential equations.


In 1959, Nash began showing clear signs of mental illness, and spent several years at psychiatric hospitals being treated for ]. After 1970, his condition slowly improved, allowing him to return to academic work by the mid-1980s.<ref name="Nasar1994"/> His struggles with his illness and his recovery became the basis for ]'s biography, '']'', as well as a ] starring ].<ref name="Oscar race scrutinizes">{{cite news |title=Oscar race scrutinizes movies based on true stories |work=] |date=March 6, 2002 |url=http://www.usatoday.com/life/movies/oscar2002/2002-03-06-true-stories.htm |accessdate=January 22, 2008}}</ref><ref>{{cite news |url=http://www.usatoday.com/life/movies/oscar2002/2002-03-24-winners.htm |title=List of Oscar Winners |work=] |accessdate=August 30, 2008 | date=March 25, 2002}}</ref><ref>{{cite web|last=Yuhas|first=Daisy|title=Throughout History, Defining Schizophrenia Has Remained A Challenge (Timeline)|url=http://www.scientificamerican.com/article.cfm?id=throughout-history-defining-schizophrenia-has-remained-challenge|work=]|accessdate=March 2, 2013}}</ref> Nash's life was the subject of ]'s 1998 biographical book '']'', and his struggles with his illness and his recovery became the basis for a ] directed by ], in which Nash was portrayed by ].<ref name="Oscar race scrutinizes">{{cite news |title=Oscar race scrutinizes movies based on true stories |work=] |date=March 6, 2002 |url=http://usatoday30.usatoday.com/life/movies/oscar2002/2002-03-06-true-stories.htm |access-date=January 22, 2008}}</ref><ref>{{cite news |url=http://usatoday30.usatoday.com/life/movies/oscar2002/2002-03-24-winners.htm |title=Academy Award Winners |work=] |access-date=August 30, 2008 |date=March 25, 2002}}</ref><ref>{{cite web |last=Yuhas |first=Daisy |title=Throughout History, Defining Schizophrenia Has Remained A Challenge (Timeline) |url=http://www.scientificamerican.com/article/throughout-history-defining-schizophrenia-has-remained-challenge/ |work=] |date=March 2013 |access-date=March 2, 2013}}</ref>


== Early life and education ==
On May 23, 2015, Nash and his wife, Alicia de Lardé Nash, while riding in a taxi, were killed in a motor vehicle accident in ].
John Forbes Nash Jr. was born on June 13, 1928, in ]. His father and namesake, John Forbes Nash Sr., was an ] for the ]. His mother, Margaret Virginia (née Martin) Nash, had been a schoolteacher before she was married. He was baptized in the ].{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 1}} He had a younger sister, Martha (born November 16, 1930).<ref name="Nash1995">{{cite conference|last1=Nash|first1=John F. Jr.|year=1995|url=https://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1994/nash-bio.html|title=John F. Nash Jr. – Biographical|book-title=The Nobel Prizes 1994: Presentations, Biographies & Lectures|editor-first1=Tore|editor-last1=Frängsmyr|publisher=]|location=Stockholm|editor-link1=Tore Frängsmyr|isbn=978-91-85848-24-9|pages=275–279}}</ref>


Nash attended kindergarten and public school, and he learned from books provided by his parents and grandparents.<ref name="Nash1995" /> Nash's parents pursued opportunities to supplement their son's education, and arranged for him to take advanced mathematics courses at nearby Bluefield College (now ]) during his final year of high school. He attended ] (which later became Carnegie Mellon University) through a full benefit of the George Westinghouse Scholarship, initially majoring in ]. He switched to a ] major and eventually, at the advice of his teacher ], to mathematics. After graduating in 1948, with both a ] and ] in mathematics, Nash accepted a fellowship to ], where he pursued further ] in mathematics and sciences.<ref name="Nash1995" />
==Youth==
Nash was born on June 13, 1928, in ], United States. His father, John Forbes Nash, was an electrical engineer for the ]. His mother, Margaret Virginia (née Martin) Nash, had been a schoolteacher before she married. He was baptized in the ] directly opposite the Martin house on Tazewell Street.<ref>{{cite book|last1=Nasar|first1=Sylvia|authorlink=Sylvia Nasar|title=]|publisher=]|date=1998|isbn=0-684-81906-6|chapterurl=https://www.nytimes.com/books/first/n/nasar-mind.html|archiveurl=https://web.archive.org/web/20001205143000/http://www.nytimes.com/books/first/n/nasar-mind.html|archivedate=December 5, 2000|deadurl=no|chapter=Chapter One|accessdate=May 24, 2015}}</ref> He had a younger sister, Martha (born November 16, 1930).


Nash's adviser and former Carnegie professor ] wrote a letter of recommendation for Nash's entrance to Princeton stating, "He is a mathematical genius."<ref>{{cite web |title=Nash recommendation letter |url=https://webspace.princeton.edu/users/mudd/Digitization/AC105/AC105_Nash_John_Forbes_1950.pdf |archive-url=https://web.archive.org/web/20170607041209/https://webspace.princeton.edu/users/mudd/Digitization/AC105/AC105_Nash_John_Forbes_1950.pdf |archive-date=June 7, 2017 |access-date=June 5, 2015 |page=23}}</ref><ref>{{cite web |editor1-first=Harold W. |editor1-last=Kuhn |editor2-first=Sylvia |editor2-last=Nasar |editor-link=Sylvia Nasar |url=http://press.princeton.edu/chapters/i7238.pdf |archive-url=https://web.archive.org/web/20070101170703/http://press.princeton.edu/chapters/i7238.pdf |archive-date=2007-01-01 |url-status=live |title=The Essential John Nash |publisher=] |pages=Introduction, xi |access-date=April 17, 2008}}</ref> Nash was also accepted at ]. However, the chairman of the mathematics department at Princeton, ], offered him the ]<!-- NOTE: not John F. Kennedy--> fellowship, convincing Nash that Princeton valued him more.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 2}} Further, he considered Princeton more favorably because of its proximity to his family in Bluefield.<ref name="Nash1995" /> At Princeton, he began work on his equilibrium theory, later known as the ].<ref>Nasar (2002), pp. xvi–xix.</ref>
===Education===
Nash attended kindergarten and public school. His parents and grandparents provided books and encyclopedias that he learned from. Nash's grandmother played piano at home, and Nash had positive memories of listening to her when he visited.<ref name="nobe"/> Nash's parents pursued opportunities to supplement their son's education, and arranged for him to take advanced ] courses at a local community college during his final year of high school. Nash attended the ] (CIT; now ]) with a full scholarship, the ''George Westinghouse Scholarship'', and initially majored in ]. He switched to ], and eventually to mathematics. After graduating in 1948 with a ] degree and an ] degree, both in mathematics, he accepted a scholarship to ], where he pursued graduate studies in mathematics.<ref name="nobe"/>


== Research contributions ==
Nash's adviser and former CIT professor ] wrote a letter of recommendation for graduate school consisting of a single sentence: "This man is a genius."<ref>{{cite web |url=http://press.princeton.edu/chapters/i7238.pdf |title=The Essential John Nash |editor=Kuhn W, Harold and Nasar, Sylvia |format=PDF | publisher=] |pages=Introduction, xi |accessdate=April 17, 2008 }}</ref> Nash was accepted by ], but the chairman of the mathematics department of Princeton, ], offered him the ]<!-- NOTE: not John F. Kennedy--> fellowship, which was enough to convince Nash that Princeton valued him more.<ref>], pp. 46–7.</ref> Nash also considered Princeton more favorably because of its location closer to his family in Bluefield.<ref name="nobe"/> He went to Princeton, where he worked on his equilibrium theory, later known as the ].
] conference in ], Germany]]

Nash did not publish extensively, although many of his papers are considered landmarks in their fields.<ref>{{cite journal | first = John | last = Milnor | author-link = John Milnor |year = 1998 | title = John Nash and 'A Beautiful Mind' | url = https://www.ams.org/notices/199810/milnor.pdf| journal = ] | volume = 25 | issue = 10|pages = 1329–1332 }}</ref> As a graduate student at Princeton, he made foundational contributions to ] and ]. As a postdoctoral fellow at ], Nash turned to ]. Although the results of Nash's work on differential geometry are phrased in a geometrical language, the work is almost entirely to do with the ] of ].<ref name="steele">{{cite journal|title=1999 Steele Prizes|journal=]|date=April 1999|pages=457–462|volume=46|issue=4|url=https://www.ams.org/notices/199904/comm-steele-prz.pdf |archive-url=https://web.archive.org/web/20000829221437/http://www.ams.org/notices/199904/comm-steele-prz.pdf |archive-date=2000-08-29 |url-status=live}}</ref> After proving his two ]s, Nash turned to research dealing directly with partial differential equations, where he discovered and proved the De Giorgi–Nash theorem, thereby resolving one form of ].


In 2011, the ] declassified letters written by Nash in the 1950s, in which he had proposed a new ]–decryption machine.<ref>{{cite web |url=https://www.nsa.gov/Press-Room/Press-Releases-Statements/Press-Release-View/Article/1630570/national-cryptologic-museum-opens-new-exhibit-on-dr-john-nash/ |publisher=] |title=2012 Press Release – National Cryptologic Museum Opens New Exhibit on Dr. John Nash |access-date=July 30, 2022}}</ref> The letters show that Nash had anticipated many concepts of modern ], which are based on ].<ref>{{cite web |url=http://agtb.wordpress.com/2012/02/17/john-nashs-letter-to-the-nsa/ |title=John Nash's Letter to the NSA; Turing's Invisible Hand |access-date=February 25, 2012|date=February 17, 2012 }}</ref>
== Major contributions ==


=== Game theory === === Game theory ===
Nash earned a ] degree in 1950 with a 28-page dissertation on ]s.<ref name="JohnNash_PhD">{{cite web| last1 =Nash| first1 =John F.| last2= | first2= | authorlink =John Forbes Nash, Jr.| coauthors =| title = Non-Cooperative Games| work = PhD thesis| publisher = Princeton University | date = May 1950| url =https://www.princeton.edu/mudd/news/faq/topics/Non-Cooperative_Games_Nash.pdf |format =PDF | doi =| accessdate =May 24, 2015 |archiveurl=http://www.webcitation.org/6YloKPaFj |archivedate=May 24, 2015 |deadurl=no}}</ref><ref>{{cite book | first = MJ | last = Osborne | year = 2004 | title = An Introduction to Game Theory | place = Oxford, ENG | publisher = ] | page = 23|isbn=0195128958}}</ref> The thesis, which was written under the supervision of doctoral advisor ], contained the definition and properties of the Nash equilibrium. A crucial concept in non-cooperative games, it won Nash the ] in 1994. Nash earned a PhD in 1950 with a 28-page dissertation on ].<ref name="JohnNash_PhD">{{cite web |last1=Nash |first1=John F. |author-link=John Forbes Nash Jr. |title=Non-Cooperative Games |work=PhD thesis |publisher=Princeton University |date=May 1950 |url=https://www.princeton.edu/mudd/news/faq/topics/Non-Cooperative_Games_Nash.pdf |access-date=May 24, 2015 |archive-url=https://web.archive.org/web/20150420144847/http://www.princeton.edu/mudd/news/faq/topics/Non-Cooperative_Games_Nash.pdf |archive-date=April 20, 2015 }}</ref><ref>{{cite book |first=Martin J. |last=Osborne |date=2004 |title=An Introduction to Game Theory |url=https://archive.org/details/introductiontoga00osbo |url-access=limited |publisher=] |location=Oxford, England |page= |isbn=0-19-512895-8}}</ref> The thesis, written under the supervision of doctoral advisor ], contained the definition and properties of the ], a crucial concept in non-cooperative games. A version of his thesis was published a year later in the ].{{sfnm|1a1=Nash|1y=1951}} In the early 1950s, Nash carried out research on a number of related concepts in game theory, including the theory of ].{{sfnm|1a1=Nash|1y=1950a|2a1=Nash|2y=1950b|3a1=Nash|3y=1953}} For his work, Nash was one of the recipients of the ] in 1994.


=== Real algebraic geometry ===
Nash's major publications relating to this concept are in the following papers:
In 1949, while still a graduate student, Nash found a new result in the mathematical field of ].{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 15}} He announced his theorem in a contributed paper at the ] in 1950, although he had not yet worked out the details of its proof.{{sfnm|1a1=Nash|1y=1952a}} Nash's theorem was finalized by October 1951, when Nash submitted his work to the ].{{sfnm|1a1=Nash|1y=1952b}} It had been well-known since the 1930s that every ] ] is ] to the ] of some collection of ]s on ]. In his work, Nash proved that those smooth functions can be taken to be ]s.<ref name="bochnak">{{cite book|mr=1659509|last1=Bochnak|first1=Jacek|last2=Coste|first2=Michel|last3=Roy|first3=Marie-Françoise|title=Real algebraic geometry|edition=Translated and revised from 1987 French original|series=]|volume=36|publisher=]|location=Berlin|year=1998|isbn=3-540-64663-9|zbl=0912.14023|doi=10.1007/978-3-662-03718-8|s2cid=118839789 |author-link3=Marie-Françoise Roy}}</ref> This was widely regarded as a surprising result,{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 15}} since the class of smooth functions and smooth manifolds is usually far more flexible than the class of polynomials. Nash's proof introduced the concepts now known as ] and ], which have since been widely studied in real algebraic geometry.<ref name="bochnak" /><ref>{{cite book|mr=0904479|last1=Shiota|first1=Masahiro|title=Nash Manifolds |series=]|volume=1269|publisher=]|location=Berlin|year=1987|isbn=3-540-18102-4|doi=10.1007/BFb0078571|zbl=0629.58002}}</ref> Nash's theorem itself was famously applied by ] and ] to the study of ]s, by combining Nash's polynomial approximation together with ].<ref>{{cite journal|mr=0176482|last1=Artin|first1=M.|last2=Mazur|first2=B.|title=On periodic points|journal=]|series=Second Series|volume=81|year=1965|pages=82–99|issue=1|doi=10.2307/1970384|jstor=1970384 |zbl=0127.13401|author-link1=Michael Artin|author-link2=Barry Mazur}}</ref><ref>{{cite journal|first1=Mikhaïl|last1=Gromov|url=https://www.ihes.fr/~gromov/wp-content/uploads/2018/08/1024.pdf|title=On the entropy of holomorphic maps|journal=]|series=2e Série|volume=49|year=2003|issue=3–4|pages=217–235|mr=2026895|zbl=1080.37051|author-link1=Mikhael Gromov (mathematician)}}</ref>
* {{cite journal | title = Equilibrium Points in N-person Games | journal = ] | year = 1950 | pages = 48–49 | pmid = 16588946 | last1 = Nash | first1 = John Forbes | volume = 36 | pmc = 1063129 | doi=10.1073/pnas.36.1.48 | issue = 1 | mr=0031701}}
* {{cite journal | title = The Bargaining Problem | journal = ] | year = 1950 | pages = 155–62 | volume = 18 | issue = 2 | mr=0035977 | last=Nash | first=John Forbes | doi=10.2307/1907266}}
* {{cite journal | title = Non-cooperative Games | journal = ] | year = 1951 | pages = 286–95 | jstor = 1969529 | issue = 2 | last1 = Nash | first1 = John Forbes | volume = 54 | doi = 10.2307/1969529 | mr=0043432}}
* {{cite journal | first=John Forbes | last=Nash | title = Two-person Cooperative Games | journal = ] | year = 1953 | pages = 128–40 | volume = 21 | issue = 1 | mr=0053471 | doi=10.2307/1906951}}


===Differential geometry===
=== Other mathematics ===
During his postdoctoral position at ], Nash was eager to find high-profile mathematical problems to study.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 20}} From ], a ], he learned about the conjecture that any ] is ] to a ] of ]. Nash's results proving the conjecture are now known as the ]s, the second of which ] has called "one of the main achievements of mathematics of the twentieth century".<ref name="Nash2015">{{cite conference|mr=3470099|book-title=Open problems in mathematics|editor-first1=John Forbes Jr.|editor-last1=Nash|editor-first2=Michael Th.|editor-last2=Rassias|publisher=]|year=2016|isbn=978-3-319-32160-8|doi=10.1007/978-3-319-32162-2|first1=Misha|last1=Gromov|author-link1=Mikhael Gromov (mathematician)|title=Introduction John Nash: theorems and ideas|arxiv=1506.05408}}</ref>
Nash did groundbreaking work in the area of ]:
* {{cite journal | last=Nash | first=John Forbes | title = Real algebraic manifolds | journal = ] | year = 1952 | pages = 405–21 | volume = 56 | issue=3 | mr=0050928 | doi=10.2307/1969649}} See {{cite journal | title = Proc. Internat. Congr. Math | publisher = AMS | year = 1952 | pages = 516–17}}


Nash's first embedding theorem was found in 1953.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 20}} He found that any Riemannian manifold can be isometrically embedded in a Euclidean space by a ] mapping.{{sfnm|1a1=Nash|1y=1954}} Nash's construction allows the ] of the embedding to be very small, with the effect that in many cases it is logically impossible that a highly-differentiable isometric embedding exists. (Based on Nash's techniques, ] soon found even smaller codimensions, with the improved result often known as the ''Nash–Kuiper theorem''.) As such, Nash's embeddings are limited to the setting of low differentiability. For this reason, Nash's result is somewhat outside the mainstream in the field of ], where high differentiability is significant in much of the usual analysis.<ref>{{cite book|last1=Eliashberg|first1=Y.|last2=Mishachev|first2=N.|title=Introduction to the h-principle|series=]|volume=48|publisher=]|location=Providence, RI|year=2002|isbn=0-8218-3227-1|mr=1909245|author-link1=Yakov Eliashberg|doi=10.1090/gsm/048}}</ref><ref name="pdr">{{cite book|last1=Gromov|first1=Mikhael|title=Partial differential relations|series=Ergebnisse der Mathematik und ihrer Grenzgebiete (3)|volume=9|publisher=]|location=Berlin|year=1986|isbn=3-540-12177-3|mr=0864505|author-link1=Mikhael Gromov (mathematician)|doi=10.1007/978-3-662-02267-2}}</ref>
His work in mathematics includes the ], which shows that every abstract ] can be ] realized as a ] of ]. He also made significant contributions to the theory of ] ]s and to ].


However, the logic of Nash's work has been found to be useful in many other contexts in ]. Starting with work of ] and László Székelyhidi, the ideas of Nash's proof were applied for various constructions of turbulent solutions of the ] in ].<ref>{{cite journal|last1=De Lellis|first1=Camillo|last2=Székelyhidi|first2=László Jr.|title=Dissipative continuous Euler flows|journal=]|volume=193|year=2013|issue=2|pages=377–407|mr=3090182|author-link1=Camillo De Lellis|doi=10.1007/s00222-012-0429-9| arxiv=1202.1751 | bibcode=2013InMat.193..377D | s2cid=2693636 }}</ref><ref>{{cite journal|last1=Isett|first1=Philip|title=A proof of Onsager's conjecture|journal=]|series=Second Series|year=2018|volume=188|issue=3|pages=871–963|mr=3866888|doi=10.4007/annals.2018.188.3.4|s2cid=119267892|url=https://authors.library.caltech.edu/87369/|arxiv=1608.08301|access-date=October 11, 2022|archive-date=October 11, 2022|archive-url=https://web.archive.org/web/20221011050610/https://authors.library.caltech.edu/87369/|url-status=dead}}</ref> In the 1970s, ] developed Nash's ideas into the general framework of ''convex integration'',<ref name="pdr" /> which has been (among other uses) applied by ] and ] to construct counterexamples to generalized forms of ] in the ].<ref>{{cite journal|last1=Müller|first1=S.|last2=Šverák|first2=V.|title=Convex integration for Lipschitz mappings and counterexamples to regularity|journal=]|series=Second Series|volume=157|year=2003|issue=3|pages=715–742|mr=1983780|author-link1=Stefan Müller (mathematician)|author-link2=Vladimir Šverák|doi=10.4007/annals.2003.157.715| s2cid=55855605 |doi-access=free|arxiv=math/0402287}}</ref>
In her book '']'', author ] explains that Nash was working on proving ], a theorem involving ] when, in 1956, he suffered a severe disappointment. He learned that an Italian mathematician, ], had published a proof just months before Nash achieved his proof. Each took different routes to get to their solutions. The two mathematicians met each other at the ] of ] during the summer of 1956. It has been speculated that if only one had solved the problem, he would have been given the ] for the proof.<ref name="nobe"/>


Nash found the construction of smoothly differentiable isometric embeddings to be unexpectedly difficult.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 20}} However, after around a year and a half of intensive work, his efforts succeeded, thereby proving the second Nash embedding theorem.{{sfnm|1a1=Nash|1y=1956}} The ideas involved in proving this second theorem are largely separate from those used in proving the first. The fundamental aspect of the proof is an ] for isometric embeddings. The usual formulations of the implicit function theorem are inapplicable, for technical reasons related to the ''loss of regularity'' phenomena. Nash's resolution of this issue, given by deforming an isometric embedding by an ] along which extra regularity is continually injected, is regarded as a fundamentally novel technique in ].<ref name="hamilton82">{{cite journal|first=Richard S.|last=Hamilton|mr=0656198|title=The inverse function theorem of Nash and Moser|journal=] |series=New Series |volume=7|year=1982|issue=1|pages=65–222|doi-access=free|doi=10.1090/s0273-0979-1982-15004-2|zbl=0499.58003|author-link1=Richard S. Hamilton}}</ref> Nash's paper was awarded the ] in 1999, where his "most original idea" in the resolution of the ''loss of regularity'' issue was cited as "one of the great achievements in mathematical analysis in this century".<ref name="steele" /> According to Gromov:<ref name="Nash2015" />
In 2011, the ] declassified letters written by Nash in the 1950s, in which he had proposed a new ]–decryption machine.<ref>{{cite web|url=http://www.nsa.gov/public_info/press_room/2012/nash_exhibit.shtml | website = ] | title = 2012 Press Release – National Cryptologic Museum Opens New Exhibit on Dr. John Nash | accessdate = February 25, 2012}}</ref> The letters show that Nash had anticipated many concepts of modern ], which are based on ].<ref>{{cite web|url=http://agtb.wordpress.com/2012/02/17/john-nashs-letter-to-the-nsa/| title= John Nash's Letter to the NSA ; Turing's Invisible Hand | accessdate = February 25, 2012}}</ref>
{{blockquote|You must be a novice in analysis or a genius like Nash to believe anything like that can be ever true and/or to have a single nontrivial application.}}


Due to ]'s extension of Nash's ideas for application to other problems (notably in ]), the resulting implicit function theorem is known as the ]. It has been extended and generalized by a number of other authors, among them Gromov, ], ], ], and ].<ref name="pdr" /><ref name="hamilton82" /> Nash himself analyzed the problem in the context of ]s.{{sfnm|1a1=Nash|1y=1966}} Schwartz later commented that Nash's ideas were "not just novel, but very mysterious," and that it was very hard to "get to the bottom of it."{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 20}} According to Gromov:<ref name="Nash2015" />
== Personal life ==
{{blockquote|Nash was solving classical mathematical problems, difficult problems, something that nobody else was able to do, not even to imagine how to do it. ...&nbsp; what Nash discovered in the course of his constructions of isometric embeddings is far from 'classical'&nbsp;– it is something that brings about a dramatic alteration of our understanding of the basic logic of analysis and differential geometry. Judging from the classical perspective, what Nash has achieved in his papers is as impossible as the story of his life&nbsp;... is work on isometric immersions&nbsp;... opened a new world of mathematics that stretches in front of our eyes in yet unknown directions and still waits to be explored.}}
In 1951, Nash was hired by the ] (MIT) as a ] in the mathematics faculty. About a year later, Nash began a relationship in ] with Eleanor Stier, a nurse he met while she cared for him as a patient. They had a son, John David Stier, but Nash left Stier when she told him of her pregnancy.<ref>Goldstein, Scott (April 10, 2005) , Boston.com News.</ref> The film based on Nash's life, '']'', was criticized during the run-up to the 2002 Oscars for omitting this aspect of his life. He was said to have abandoned her based on her social status, which he thought to have been beneath his.<ref>Sutherland, John (March 18, 2002) , ''The Guardian'', March 18, 2002.</ref>


===Partial differential equations===
In 1954, while in his 20s, Nash was arrested for ] in an ] of homosexuals in ]. Although the charges were dropped, he was stripped of his ] and fired from ], where he had spent a few summers as a consultant.<ref>{{cite news |first=Sylvia|last=Nasar |authorlink=Sylvia Nasar |title=The sum of a man |url=http://www.guardian.co.uk/books/2002/mar/26/biography.highereducation |quote=Contrary to widespread references to Nash's "numerous homosexual liaisons", he was not gay. While he had several emotionally intense relationships with other men when he was in his early 20s, I never interviewed anyone who claimed, much less provided evidence, that Nash ever had sex with another man. Nash was arrested in a police trap in a public lavatory in Santa Monica in 1954, at the height of the McCarthy hysteria. The military think-tank where he was a consultant, stripped him of his top-secret security clearance and fired him ... The charge – indecent exposure – was dropped. |newspaper=] |date= March 25, 2002 |accessdate=July 9, 2012 }}</ref>
While spending time at the ] in New York City, ] informed Nash of a well-known conjecture in the field of ]s.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 30}} In 1938, ] had proved a fundamental ] result for functions of two independent variables, but analogous results for functions of more than two variables had proved elusive. After extensive discussions with Nirenberg and ], Nash was able to extend Morrey's results, not only to functions of more than two variables, but also to the context of ]s.{{sfnm|1a1=Nash|1y=1957|2a1=Nash|2y=1958}} In his work, as in Morrey's, uniform control over the continuity of the solutions to such equations is achieved, without assuming any level of differentiability on the coefficients of the equation. The ] was a particular result found in the course of his work (the proof of which Nash attributed to ]), which has been found useful in other contexts.<ref name="davies">{{cite book|mr=0990239|last1=Davies|first1=E. B.|title=Heat kernels and spectral theory|series=Cambridge Tracts in Mathematics|volume=92|publisher=]|location=Cambridge|year=1989|isbn=0-521-36136-2|doi=10.1017/CBO9780511566158|author-link1=E. Brian Davies}}</ref><ref>{{cite book|mr=2569498|last1=Grigor'yan|first1=Alexander|title=Heat kernel and analysis on manifolds|series=AMS/IP Studies in Advanced Mathematics|volume=47|publisher=]|location=Providence, RI|year=2009|isbn=978-0-8218-4935-4|doi=10.1090/amsip/047}}</ref><ref>{{cite book|mr=1840042|last1=Kigami|first1=Jun|title=Analysis on fractals|series=Cambridge Tracts in Mathematics|volume=143|publisher=]|location=Cambridge|year=2001|isbn=0-521-79321-1}}</ref><ref>{{cite book|mr=1817225 |last1=Lieb|first1=Elliott H.|last2=Loss|first2=Michael|title=Analysis|edition=Second edition of 1997 original|series=]|volume=14|publisher=]|location=Providence, RI|year=2001|isbn=0-8218-2783-9|author-link1=Elliott Lieb|author-link2=Michael Loss}}</ref>


Soon after, Nash learned from ], recently returned from Italy, that the then-unknown ] had found nearly identical results for elliptic partial differential equations.{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 30}} De Giorgi and Nash's methods had little to do with one another, although Nash's were somewhat more powerful in applying to both elliptic and parabolic equations. A few years later, inspired by De Giorgi's method, ] found a different approach to the same results, and the resulting body of work is now known as the De Giorgi–Nash theorem or the De Giorgi–Nash–Moser theory (which is distinct from the ]). De Giorgi and Moser's methods became particularly influential over the next several years, through their developments in the works of ], ], and ], among others.<ref>{{cite book|mr=1814364|last1=Gilbarg|first1=David|last2=Trudinger|first2=Neil S.|title=Elliptic partial differential equations of second order|edition=Reprint of the second|series=Classics in Mathematics|publisher=]|location=Berlin|year=2001|isbn=3-540-41160-7|doi=10.1007/978-3-642-61798-0|author-link1=David Gilbarg|author-link2=Neil Trudinger}}</ref><ref>{{cite book|mr=1465184|last1=Lieberman|first1=Gary M.|title=Second order parabolic differential equations|publisher=]|location=River Edge, NJ|year=1996|isbn=981-02-2883-X|doi=10.1142/3302}}</ref> Their work, based primarily on the judicious choice of ]s in the ] of partial differential equations, is in strong contrast to Nash's work, which is based on analysis of the ]. Nash's approach to the De Giorgi–Nash theory was later revisited by ] and ], initiating the re-derivation and extension of the results originally obtained from De Giorgi and Moser's techniques.<ref name="davies" /><ref>{{cite journal|mr=0855753|last1=Fabes|first1=E. B.|last2=Stroock|first2=D. W.|title=A new proof of Moser's parabolic Harnack inequality using the old ideas of Nash|journal=]|volume=96|year=1986|issue=4|pages=327–338|doi=10.1007/BF00251802 |bibcode=1986ArRMA..96..327F |s2cid=189774501 |author-link2=Daniel Stroock}}</ref>
Not long after breaking up with Stier, Nash met Alicia Lopez-Harrison de Lardé (born January 1, 1933), a naturalized U.S. citizen from ]. De Lardé graduated from MIT, having majored in ].<ref name="nobe"/> They married in February 1957; although Nash was an atheist, the ceremony was held at a ] church.<ref name="Sylvia Nasar 2011 143">], Chapter 17: Bad Boys, p. 143: "In this circle, Nash learned to make a virtue of necessity, styling himself self-consciously as a "free thinker." He announced that he was an atheist."</ref><ref>], p. 212: "Nash, by then an atheist, balked at a Catholic ceremony. He would have been happy to get married in city hall."</ref>


From the fact that minimizers to many functionals in the ] solve elliptic partial differential equations, ] (on the smoothness of these minimizers), conjectured almost sixty years prior, was directly amenable to the De Giorgi–Nash theory. Nash received instant recognition for his work, with ] describing it as a "stroke of genius".{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 30}} Nash would later speculate that had it not been for De Giorgi's simultaneous discovery, he would have been a recipient of the prestigious ] in 1958.<ref name="Nash1995" /> Although the medal committee's reasoning is not fully known, and was not purely based on questions of mathematical merit,{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 31}} archival research has shown that Nash placed third in the committee's vote for the medal, after the two mathematicians (] and ]) who were awarded the medal that year.<ref>{{cite journal|last1=Barany|first1=Michael|title=The Fields Medal should return to its roots|journal=]|volume=553|date=January 18, 2018|issue=7688 |pages=271–273|doi=10.1038/d41586-018-00513-8|bibcode=2018Natur.553..271B |doi-access=free}}</ref>
In 1958, Nash was given a tenured position at MIT, and his first signs of mental illness were evident in early 1959. At this time, his wife was pregnant with their first child. He resigned his position as a member of the MIT mathematics faculty in the spring of 1959<ref name="nobe"/> and his wife had him admitted to ] for treatment of ] that same year. Their son, John Charles Martin Nash, was born soon afterward. The child was not named for a year because his wife felt Nash should have a say in the name given to the boy. Due to the stress of dealing with his illness, Nash and de Lardé divorced in 1963. After his final hospital discharge in 1970, Nash lived in de Lardé's house as a boarder. This stability seemed to help him, and he learned how to consciously discard his paranoid ]s.<ref name='david'>, ''The New York Times'', June 11, 1998</ref> He stopped taking psychiatric medication and was allowed by Princeton to audit classes. He continued to work on mathematics and eventually he was allowed to teach again. In the 1990s, de Lardé and Nash resumed their relationship, remarrying in 2001.

Nash was a longtime resident of ].<ref>{{cite news |url=http://business.highbeam.com/62734/article-1P1-51401334/john-forbes-nash-may-lose-nj-home |title=John Forbes Nash May Lose N.J. Home |agency=] |date=March 14, 2002 |quote=West Windsor, N.J.: John Forbes Nash, Jr., whose life is chronicled in the Oscar-nominated movie ''A Beautiful Mind,'' could lose his home if the township picks one of its proposals to replace a nearby bridge.|accessdate=February 22, 2011| via=]}}</ref>


== Mental illness == == Mental illness ==
Although Nash's ] first began to manifest in the form of ], his wife later described his behavior as erratic. Nash thought that all men who wore red ties were part of a ] conspiracy against him. He mailed letters to embassies in Washington, D.C., declaring that they were establishing a government.<ref name="Nasar1994" /><ref>], p. 251.</ref> Nash's psychological issues crossed into his professional life when he gave an ] lecture at ] in early 1959. Originally intended to present proof of the ], the lecture was incomprehensible. Colleagues in the audience immediately realized that something was wrong.<ref>{{cite book |first=Karl |last=Sabbagh |title=Dr. Riemann's Zeros |publisher=] |location=London, England |date=2003 |isbn=1-84354-100-9 |pages= |url=https://archive.org/details/drriemannszeros0000sabb/page/87 }}</ref>
] conference in ], Germany]]
Nash's mental illness first began to evidently manifest in the form of ]; his wife later described his behavior as erratic. Nash seemed to believe that all men who wore red ties were part of a ] conspiracy against him; Nash mailed letters to embassies in ], declaring that they were establishing a government.<ref name="Nasar1994" /><ref>], p. 251.</ref> Nash's psychological issues crossed into his professional life when he gave an ] lecture at ] in 1959. Although ostensibly pertaining to a proof of the ], the lecture was incomprehensible. Colleagues in the audience immediately realized that something was wrong.<ref>{{cite book |title=Dr. Riemann's Zeros |first=Karl |last=Sabbagh |location=London |publisher=] |year=2003 |isbn=1-84354-100-9 |pages=87–88 }}</ref>


In April 1959, Nash was admitted to ] for one month. Based on his paranoid, persecutory ], ], and increasing ], he was diagnosed with ].<ref>{{cite web| url=http://www.brown.edu/Courses/BI_278/Other/Clerkship/Didactics/Readings/Schizophrenia.pdf | title=Brown University Didactic Readings: DSM-IV Schizophrenia (DSM-IV-TR #295.1–295.3, 295.90) | publisher=] | location=Providence, Rhode Island|access-date=June 1, 2015 | pages=1–11}}</ref><ref name="Nasar ABM">], p. 32.</ref> In 1961, Nash was admitted to the ].<ref>{{MacTutor|id=Nash}}</ref> Over the next nine years, he spent intervals of time in ]s, where he received both ] ] and ].<ref name="Nasar ABM" /><ref name="Roger Ebert's Movie">{{cite book |first=Roger |last=Ebert|author-link=Roger Ebert|title=Roger Ebert's Movie Yearbook 2003 |publisher=] |date=2002 |url=https://archive.org/details/rogerebertsmovie00roge_6 |url-access=registration |access-date=July 10, 2008 |isbn=978-0-7407-2691-0}}</ref>
He was admitted to the McLean Hospital, April–May 1959, where he was diagnosed with ]. The clinical diagnosis is dominated by relatively stable, often paranoid, fixed beliefs that are either false, over-imaginative or unrealistic, usually accompanied by experiences of seemingly real perception of something not actually present – particularly auditory and perceptional disturbances, a lack of motivation for life, and mild ].<ref name="Nasar ABM">], p. 32.</ref>


Although he sometimes took prescribed medication, Nash later wrote that he did so only under pressure. According to Nash, the film ''A Beautiful Mind'' inaccurately implied he was taking ]s. He attributed the depiction to the screenwriter who was worried about the film encouraging people with mental illness to stop taking their medication.<ref>{{cite web|first=Marika|last=Greihsel|url=https://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1994/nash-interview.html|title=John F. Nash Jr. – Interview|website=Nobel Foundation|date=September 1, 2004|access-date=November 3, 2018}}</ref>
In 1961, Nash was admitted to the ].<ref>{{MacTutor Biography|id=Nash}}</ref> Over the next nine years, he spent periods in ]s, where, aside from receiving ] ], he was administered ].<ref name="Nasar ABM"/><ref name="Roger Ebert's Movie">{{cite book|last=Ebert |first=Roger|title=Roger Ebert's Movie Yearbook 2003|publisher=]|year=2002|url=http://books.google.com/?id=HJGZOs4S4_EC|accessdate=July 10, 2008|isbn=978-0-7407-2691-0}}</ref><ref name="Gracefully Insane">{{cite book|last=Beam|first=Alex|title=Gracefully Insane: The Rise and Fall of America's Premier Mental Hospital|publisher=]|year=2001|url =http://books.google.com/?id=M2ZrduulEAwC|accessdate=July 10, 2008|isbn=978-1-58648-161-2}}</ref>


Nash did not take any medication after 1970, nor was he committed to a hospital ever again.<ref>{{cite web|first=John Forbes|last=Nash|url=https://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_11.html|title=PBS Interview: Medication|publisher=]|year=2002|access-date=September 1, 2017|archive-date=June 4, 2016|archive-url=https://web.archive.org/web/20160604221411/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_11.html}}</ref> Nash recovered gradually.<ref>Nash, John {{Webarchive|url=https://web.archive.org/web/20160606080035/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_14.html |date=June 6, 2016 }} 2002.</ref> Encouraged by his then former wife, Lardé, Nash lived at home and spent his time in the Princeton mathematics department where his eccentricities were accepted even when his mental condition was poor. Lardé credits his ] to maintaining "a quiet life" with ].<ref name="Nasar1994" />
Although he sometimes took prescribed medication, Nash later wrote that he only ever did so under pressure. After 1970, he was never committed to a hospital again, and he refused any further medication. According to Nash, the film ''A Beautiful Mind'' inaccurately implied that he was taking the new ]s during this period. He attributed the depiction to the screenwriter (whose mother, he notes, was a psychiatrist), who was worried about the film encouraging people with the disorder to stop taking their medication.<ref>Greihsel, Marika (September 1, 2004) . Nobel Foundation.</ref> Journalist ] wrote an article suggesting that recovery from problems like Nash's can be hindered by such drugs.<ref>Whitaker, R. (March 4, 2002) . ''USA Today''.</ref>


Nash dated the start of what he termed "mental disturbances" to the early months of 1959, when his wife was pregnant. He described a process of change "from scientific rationality of thinking into the delusional thinking characteristic of persons who are psychiatrically diagnosed as 'schizophrenic' or 'paranoid schizophrenic{{'"}}.<ref name="Nash1995" /> For Nash, this included seeing himself as a messenger or having a special function of some kind, of having supporters and opponents and hidden schemers, along with a feeling of being persecuted and searching for signs representing divine revelation.<ref>Nash, John {{Webarchive|url=https://web.archive.org/web/20161001215421/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_12.html |date=October 1, 2016 }}. 2002.</ref> During his psychotic phase, Nash also ] as "Johann von Nassau".{{sfnm|1a1=Nasar|1y=1998|1loc=Chapter 39}} Nash suggested his delusional thinking was related to his unhappiness, his desire to be recognized, and his characteristic way of thinking, saying, "I wouldn't have had good scientific ideas if I had thought more normally." He also said, "If I felt completely pressureless I don't think I would have gone in this pattern".<ref>Nash, John {{Webarchive|url=https://web.archive.org/web/20170310042743/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_05.html |date=March 10, 2017 }} 2002.</ref>
Nash has said the psychotropic drugs are overrated and that the adverse effects are not given enough consideration once someone is deemed ].<ref>Nash, John . 2002.</ref><ref>Nash, John . 2002.</ref><ref>Nash, John 2002.</ref> According to Sylvia Nasar, author of the book ''A Beautiful Mind'', on which the movie was based, Nash recovered gradually with the passage of time. Encouraged by his then former wife, de Lardé, Nash worked in a ] setting where his eccentricities were accepted. De Lardé said of Nash, "it's just a question of living a quiet life".<ref name="Nasar1994"/>


Nash dated the start of what he termed "mental disturbances" to the early months of 1959, when his wife was pregnant. He described a process of change "from scientific rationality of thinking into the delusional thinking characteristic of persons who are psychiatrically diagnosed as 'schizophrenic' or 'paranoid schizophrenic'"<ref name="Nash1995">Nash, John (1995) from Les Prix Nobel. The Nobel Prizes 1994, Editor Tore Frängsmyr, , Stockholm, 1952,</ref> including seeing himself as a messenger or having a special function in some way, and with supporters and opponents and hidden schemers, and a feeling of being persecuted, and looking for signs representing divine revelation.<ref>Nash, John . 2002.</ref> Nash suggested his delusional thinking was related to his unhappiness, his desire to feel important and be recognized, and his characteristic way of thinking, saying, "I wouldn't have had good scientific ideas if I had thought more normally." He also said, "If I felt completely pressureless I don't think I would have gone in this pattern".<ref>Nash, John 2002.</ref> He did not draw a categorical distinction between schizophrenia and ].<ref>Nash, John (April 10, 2005) . Interview by Shane Hegarty. Schizophrenia.com.</ref> Nash reported that he did not hear voices until around 1964, and later engaged in a process of consciously rejecting them.<ref>Nash, John . 2002.</ref> He reported that he was always taken to hospitals against his will. He only temporarily renounced his "dream-like delusional hypotheses" after being in a hospital long enough to decide to superficially conform – to behave normally or to experience "enforced rationality". Only gradually on his own did he "intellectually reject" some of the "delusionally influenced" and "politically oriented" thinking as a waste of effort. However, by 1995, although he was "thinking rationally again in the style that is characteristic of scientists," he said he also felt more limited.<ref name="Nash1995"/><ref name=Experiences>Nash, John . PBS Interview,2002.</ref> Nash reported that he started hearing voices in 1964, then later engaged in a process of consciously rejecting them.<ref>Nash, John {{Webarchive|url=https://web.archive.org/web/20120309213637/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_06.html |date=March 9, 2012 }}. 2002.</ref> He only renounced his "dream-like delusional hypotheses" after a prolonged period of involuntary commitment in mental hospitals—"enforced rationality". Upon doing so, he was temporarily able to return to productive work as a mathematician. By the late 1960s, he relapsed.<ref>Nash, John {{Webarchive|url=https://web.archive.org/web/20160605170425/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_13.html |date=June 5, 2016 }}. 2002.</ref> Eventually, he "intellectually rejected" his "{{not a typo|delusionally}} influenced" and "politically oriented" thinking as a waste of effort.<ref name="Nash1995" /> In 1995, he said that he did not realize his full potential due to nearly 30 years of mental illness.<ref name=Experiences>Nash, John {{Webarchive|url=https://web.archive.org/web/20161207174723/http://www.pbs.org/wgbh/amex/nash/sfeature/sf_nash_08.html |date=December 7, 2016 }}. PBS Interview, 2002.</ref>


Nash wrote in 1994: Nash wrote in 1994:
{{blockquote|I spent times of the order of five to eight months in hospitals in New Jersey, always on an involuntary basis and always attempting a legal argument for release. And it did happen that when I had been long enough hospitalized that I would finally renounce my delusional hypotheses and revert to thinking of myself as a human of more conventional circumstances and return to mathematical research. In these interludes of, as it were, enforced rationality, I did succeed in doing some respectable mathematical research. Thus there came about the research for "Le problème de Cauchy pour les équations différentielles d'un fluide général"; the idea that Prof. ] called "the Nash blowing-up transformation"; and those of "Arc Structure of Singularities" and "Analyticity of Solutions of Implicit Function Problems with Analytic Data".


But after my return to the dream-like delusional hypotheses in the later 60s I became a person of {{not a typo|delusionally}} influenced thinking but of relatively moderate behavior and thus tended to avoid hospitalization and the direct attention of psychiatrists.
{{quote|I spent times of the order of five to eight months in hospitals in ], always on an involuntary basis and always attempting a legal argument for release. And it did happen that when I had been long enough hospitalized that I would finally renounce my delusional hypotheses and revert to thinking of myself as a human of more conventional circumstances and return to mathematical research. In these interludes of, as it were, enforced rationality, I did succeed in doing some respectable mathematical research. Thus there came about the research for "Le problème de Cauchy pour les équations différentielles d'un fluide général"; the idea that ] called "the Nash blowing-up transformation"; and those of "Arc Structure of Singularities" and "Analyticity of Solutions of Implicit Function Problems with Analytic Data".


Thus further time passed. Then gradually I began to intellectually reject some of the {{not a typo|delusionally}} influenced lines of thinking which had been characteristic of my orientation. This began, most recognizably, with the rejection of politically oriented thinking as essentially a hopeless waste of intellectual effort. So at the present time I seem to be thinking rationally again in the style that is characteristic of scientists.<ref name="Nash1995" />}}
But after my return to the dream-like delusional hypotheses in the later 60s I became a person of delusionally influenced thinking but of relatively moderate behavior and thus tended to avoid hospitalization and the direct attention of psychiatrists.

Thus further time passed. Then gradually I began to intellectually reject some of the delusionally influenced lines of thinking which had been characteristic of my orientation. This began, most recognizably, with the rejection of politically oriented thinking as essentially a hopeless waste of intellectual effort. So at the present time I seem to be thinking rationally again in the style that is characteristic of scientists.<ref name="nobe">{{cite web|url=http://www.nobelprize.org/nobel_prizes/economics/laureates/1994/nash-autobio.html|title=John F. Nash, Jr. – Autobiography|year=1994|accessdate=February 5, 2011|publisher=]}}</ref>}}


== Recognition and later career == == Recognition and later career ==
]
In 1978, Nash was awarded the ] for his discovery of non-cooperative equilibria, now called Nash equilibria. He won the ] in 1999.
In 1978, Nash was awarded the ] for his discovery of non-cooperative equilibria, now called Nash Equilibria. He won the ] in 1999.


In 1994, he received the Nobel Memorial Prize in Economic Sciences (along with ] and ]) as a result of his ] work as a Princeton graduate student. In the late 1980s, Nash had begun to use email to gradually link with working mathematicians who realized that he was ''the'' John Nash and that his new work had value. They formed part of the nucleus of a group that contacted the ]'s Nobel award committee and were able to vouch for Nash's mental health ability to receive the award in recognition of his early work.{{Citation needed|date=September 2008}} In 1994, he received the ] (along with ] and ]) for his ] work as a Princeton graduate student.<ref>Nasar (2002), p. xiii.</ref> In the late 1980s, Nash had begun to use email to gradually link with working mathematicians who realized that he was {{em|the}} John Nash and that his new work had value. They formed part of the nucleus of a group that contacted the ]'s Nobel award committee and were able to vouch for Nash's mental health and ability to receive the award.<ref>{{cite journal|title=The Work of John Nash in Game Theory|journal=Nobel Seminar|date=December 8, 1994|url=https://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1994/nash-lecture.pdf|archive-url=https://web.archive.org/web/20130810134711/https://www.nobelprize.org/nobel_prizes/economic-sciences/laureates/1994/nash-lecture.pdf|archive-date=August 10, 2013|access-date=May 29, 2015}}</ref>


{{As of|2011}} Nash's recent work involved ventures in advanced game theory, including partial agency, which show that, as in his early career, he preferred to select his own path and problems. Between 1945 and 1996, he published 23 scientific studies. Nash's later work involved ventures in advanced game theory, including partial agency, which show that, as in his early career, he preferred to select his own path and problems. Between 1945 and 1996, he published 23 scientific papers.


Nash has suggested hypotheses on mental illness. He has compared not thinking in an acceptable manner, or being "insane" and not fitting into a usual social function, to being "on ]" from an economic point of view. He has advanced views in ] about the value of human diversity and the potential benefits of apparently nonstandard behaviors or roles.<ref>{{cite web|last=Neubauer |first= David |date=June 1, 2007 |url=http://health.yahoo.com/experts/depression/8207/john-nash-and-a-beautiful-mind-on-strike/ |title=John Nash and a Beautiful Mind on Strike |website=Yahoo! Health |archiveurl=http://web.archive.org/web/20080421192944/http://health.yahoo.com/experts/depression/8207/john-nash-and-a-beautiful-mind-on-strike/ |archivedate=April 21, 2008 }}</ref> Nash has suggested hypotheses on mental illness. He has compared not thinking in an acceptable manner, or being "insane" and not fitting into a usual social function, to being "on ]" from an economic point of view. He advanced views in ] about the potential benefits of apparently nonstandard behaviors or roles.<ref>{{cite web |last=Neubauer |first=David |date=June 1, 2007 |url=http://health.yahoo.com/experts/depression/8207/john-nash-and-a-beautiful-mind-on-strike/ |title=John Nash and a Beautiful Mind on Strike |website=Yahoo! Health |archive-url=https://web.archive.org/web/20080421192944/http://health.yahoo.com/experts/depression/8207/john-nash-and-a-beautiful-mind-on-strike/ |archive-date=April 21, 2008}}</ref>


Nash has developed work on the role of money in society. Within the framing theorem that people can be so controlled and motivated by money that they may not be able to reason rationally about it, he has criticized interest groups that promote quasi-doctrines based on ] that permit manipulative short-term ] and ] tactics that ultimately undermine currencies. He has suggested a global "industrial consumption ]" system that would support the development of more "]" that people could trust rather than more unstable "bad money". He notes that some of his thinking parallels economist and ] ]'s thinking regarding money and a nontypical viewpoint of the function of the authorities.<ref>{{cite journal|author=Nash, John |year=2002|jstor=1061553 |title=Ideal Money|journal=]|volume= 69|issue=1|pages=4–11|doi=10.2307/1061553}}</ref><ref>Zuckerman, Julia (April 27, 2005) . ''The Brown Daily Herald''.</ref> Nash criticized ] of ] which allowed for a ] to implement ].<ref name=":0" /> He proposed a standard of "Ideal Money" pegged to an "industrial consumption ]" which was more stable than "bad money." He noted that his thinking on money and the function of ] paralleled that of economist ].{{sfnm|1a1=Nash|1y=2002a}}<ref name=":0">Zuckerman, Julia (April 27, 2005) . ''The Brown Daily Herald''. By JULIA ZUCKERMAN Wednesday, April 27, 2005</ref>


Nash received an honorary degree, Doctor of Science and Technology, from Carnegie Mellon University in 1999, an honorary degree in economics from the ] on March 19, 2003,<ref>{{cite web|url=http://ricerca.repubblica.it/repubblica/archivio/repubblica/2003/03/19/napoli-laurea-nash-il-genio-dei-numeri.html|title=Napoli, laurea a Nash il 'genio dei numeri'|date=March 19, 2003|publisher=la Repubblica.it|first=Patrizia|last=Capua|language=Italian}}</ref> an honorary doctorate in economics from the ] in April 2007, and was keynote speaker at a conference on game theory. He has also been a prolific guest speaker at a number of world-class events, such as the ] in 2005 held at the ]. In 2012 he was elected as a fellow of the American Mathematical Society.<ref>, retrieved February 24, 2013.</ref> On May 19, 2015, he and Louis Nirenberg were presented with the 2015 ] by ] at a ceremony in Oslo.<ref>{{cite web|url=http://www.abelprize.no/nyheter/vis.html?tid=63693|title=Nash and Nirenberg received the Abel Prize from the King of Norway|publisher=The Norwegian Academy of Science and Letters|accessdate=May 24, 2015}}</ref> Nash received an honorary degree, Doctor of Science and Technology, from ] in 1999, an honorary degree in economics from the ] in 2003,<ref>{{cite web |url=http://ricerca.repubblica.it/repubblica/archivio/repubblica/2003/03/19/napoli-laurea-nash-il-genio-dei-numeri.html |title=Napoli, laurea a Nash il 'genio dei numeri' |date=March 19, 2003 |publisher=la Repubblica.it |first=Patrizia |last=Capua |language=it}}</ref> an honorary doctorate in economics from the ] in 2007, an honorary doctorate of science from the ] in 2011,<ref name = cs-slate-2001-12>{{Cite news |first=Chris |last=Suellentrop |title=A Real Number |url=http://www.slate.com/articles/arts/culturebox/2001/12/a_real_number.single.html |magazine=] |date=December 21, 2001| archive-url = https://web.archive.org/web/20140104104531/http://www.slate.com/articles/arts/culturebox/2001/12/a_real_number.single.html| archive-date = January 4, 2014| url-status = live| access-date = May 28, 2015 |quote=''A Beautiful Mind's'' John Nash is nowhere near as complicated as the real one.}}</ref> and was keynote speaker at a conference on game theory.<ref>{{cite web|title=Nobel Laureate John Nash to Visit HK|url=http://www.china.org.cn/english/scitech/55597.htm|website=china.org.cn|access-date=January 7, 2017}}</ref> Nash also received honorary doctorates from two West Virginia colleges: the University of Charleston in 2003 and West Virginia University Tech in 2006. He was a prolific guest speaker at a number of events, such as the Warwick Economics Summit in 2005, at the ].


Nash was elected to the ] in 2006<ref>{{Cite web|title=APS Member History |url=https://search.amphilsoc.org/memhist/search?creator=John+F.+Nash&title=&subject=&subdiv=&mem=&year=&year-max=&dead=&keyword=&smode=advanced |access-date=May 25, 2021|website=search.amphilsoc.org}}</ref> and became a fellow of the American Mathematical Society in 2012.<ref>. Retrieved February 24, 2013.</ref>
Upon his death, obituaries appeared in scientific and conventional media throughout the world. In addition to their obituary for Nash,<ref name="NYT death">{{cite news|first=Erica|last=Goode|url=http://www.nytimes.com/2015/05/25/science/john-nash-a-beautiful-mind-subject-and-nobel-winner-dies-at-86.html|title=John F. Nash Jr., Math Genius Defined by a 'Beautiful Mind,' Dies at 86|work=]|date=May 24, 2015|accessdate=May 24, 2015}}</ref> '']'' also published an article containing many notable quotes of Nash, assembled from diverse media and publications, providing his reflections on his life and achievements,<ref name="NYT quotes">{{cite news|title=The Wisdom of a Beautiful Mind|url=http://www.nytimes.com/interactive/2015/05/25/science/john-nash-quotes.html|website=]|accessdate=May 25, 2015|date=May 24, 2015}}</ref> as well as an article on the cornerstone of ] on making choices in life.<ref name="NYT cornerstone">{{cite news|last1=Chang|first1=Kenneth|title=Explaining a Cornerstone of Game Theory: John Nash’s Equilibrium|url=http://www.nytimes.com/2015/05/25/science/explaining-a-cornerstone-of-game-theory-john-nashs-equilibrium.html|website=]|accessdate=May 25, 2015|date=May 24, 2015}}</ref>


On May 19, 2015, a few days before his death, Nash, along with ], was awarded the 2015 ] by King ] at a ceremony in Oslo.<ref>{{cite web |title=2015: Nash and Nirenberg |url=https://abelprize.no/abel-prize-laureates/2015 |access-date=August 2, 2022 |website=abelprize.no }}</ref>
==Death==
While riding in a ] on May 23, 2015, Nash and his wife, Alicia de Lardé Nash, were killed as the result of a motor vehicle collision on the ] near ]. They were on their way home after a visit to Norway where Nash had received the ]. The driver of the cab they were riding in from ] lost control of the vehicle and eventually struck a guard rail. Both Nash and his wife were ejected from the car upon impact.<ref>{{cite news|title=Famed 'A Beautiful Mind' mathematician John Nash, wife killed in taxi crash, police say|last=Ma|first=Myles|publisher=NJ.com|url=http://www.nj.com/middlesex/index.ssf/2015/05/famed_a_beautiful_mind_mathematician_wife_killed_in_taxi_crash_police_say.html|date=May 23, 2015|accessdate=May 23, 2015}}</ref><ref>{{cite news|title='A Beautiful Mind' mathematician John Nash, wife killed in crash|url=http://www.usatoday.com/story/news/nation/2015/05/24/john-nash-dies/27879515/|accessdate=May 24, 2015|agency=USA News}}</ref><ref>{{cite news|title='Beautiful Mind' mathematician John Nash killed in crash|url=http://www.bbc.com/news/world-us-canada-32865248|accessdate=May 24, 2015|agency=BBC News}}</ref><ref>{{cite news|title=Princeton mathematician John Nash and his wife, Alicia, are killed in a car accident|url=http://qz.com/411383/princeton-mathematician-john-nash-and-his-wife-alicia-are-killed-in-a-car-accident/|accessdate=May 24, 2015|agency=QUARTZ}}</ref><ref>{{cite web|title=John Nash, mathematician who inspired 'A Beautiful Mind', killed in car crash|url=http://www.reuters.com/article/2015/05/24/us-people-nash-idUSKBN0O90JR20150524|website=Reuters.com|publisher=Thomson Reuters|accessdate=May 24, 2015}}</ref> John Nash was 86 years old at the time of his death.<ref>{{cite web|last1=Sandoval|first1=Edgar|last2=Otis|first2=Ginger Adams|title=John Nash, 86, inspiration for the film 'A Beautiful Mind,' and wife die in car accident on New Jersey Turnpike: police|url=http://www.nydailynews.com/news/crime/john-nash-86-dies-car-accident-article-1.2233775|website=]|date=May 25, 2015|accessdate=May 25, 2015}}</ref>
== Representation in culture ==
At Princeton, campus legend Nash became known as "The Phantom of Fine Hall"<ref>{{cite news|last=Kwon|first=Ha Kyung|title=Nash GS ’50: ‘The Phantom of Fine Hall'|url=http://dailyprincetonian.com/news/2010/12/nash-gs-50-the-phantom-of-fine-hall/|accessdate=May 6, 2014|newspaper=]|date=December 10, 2010}}</ref> (Princeton's mathematics center), a shadowy figure who would scribble arcane equations on blackboards in the middle of the night. He is referred to in a novel set at Princeton, ''The Mind-Body Problem'', 1983, by ].<ref name="Nasar1994">{{cite news|last1=Nasar|first1=Sylvia|authorlink1=Sylvia Nasar|title=The Lost Years of a Nobel Laureate|url=http://www.nytimes.com/1994/11/13/business/the-lost-years-of-a-nobel-laureate.html?pagewanted=all|website=]|accessdate=May 6, 2014|location=Princeton, New Jersey|date=November 13, 1994}}</ref>


== Personal life ==
]'s biography of Nash, '']'', was published in 1998. A ] was released in 2001, directed by ] with ] playing Nash.
In 1951, the ] (MIT) hired Nash as a ] in the mathematics faculty. About a year later, Nash began a relationship with Eleanor Stier, a nurse he met while admitted as a patient. They had a son, John David Stier,<ref name = cs-slate-2001-12 /> but Nash left Stier when she told him of her pregnancy.<ref>Goldstein, Scott (April 10, 2005) , Boston.com News.</ref> The film based on Nash's life, ''A Beautiful Mind'', was criticized during the run-up to the 2002 Oscars for omitting this aspect of his life. He was said to have abandoned her based on her social status, which he thought to have been beneath his.<ref>Sutherland, John (March 18, 2002) , ''The Guardian'', March 18, 2002.</ref>

In ], in 1954, while in his twenties, Nash was arrested for ] in a sting operation targeting gay men.<ref>{{ cite news |title=John Nash, mathematician – obituary |url=https://www.telegraph.co.uk/news/obituaries/11627306/John-Nash-mathematician-obituary.html |archive-url=https://ghostarchive.org/archive/20220111/https://www.telegraph.co.uk/news/obituaries/11627306/John-Nash-mathematician-obituary.html |archive-date=January 11, 2022 |url-access=subscription |url-status=live |newspaper=The Telegraph |date=May 24, 2015 |access-date=August 29, 2016}}{{cbignore}}</ref> Although the charges were dropped, he was stripped of his top-secret ] and fired from ], where he had worked as a consultant.<ref>{{cite news |first=Sylvia |last=Nasar |author-link=Sylvia Nasar |title=The sum of a man |url=https://www.theguardian.com/books/2002/mar/26/biography.highereducation |quote=Contrary to widespread references to Nash's "numerous homosexual liaisons", he was not gay. While he had several emotionally intense relationships with other men when he was in his early 20s, I never interviewed anyone who claimed, much less provided evidence, that Nash ever had sex with another man. Nash was arrested in a police trap in a public lavatory in Santa Monica in 1954, at the height of the McCarthy hysteria. The military think-tank where he was a consultant, stripped him of his top-secret security clearance and fired him ... The charge – indecent exposure – was dropped. |newspaper=] |date=March 25, 2002 |access-date=July 9, 2012}}</ref>

Not long after breaking up with Stier, Nash met ], a ] from ]. Lardé was graduated from ], having majored in physics.<ref name="Nash1995" /> They married in February 1957. Although Nash was an ],<ref name="Sylvia Nasar 2011 143">], Chapter 17: Bad Boys, p. 143: "In this circle, Nash learned to make a virtue of necessity, styling himself self-consciously as a "free thinker." He announced that he was an atheist."</ref> the ceremony was performed in an ].<ref name="charlesmartin">{{Cite web|last=Livio|first=Susan K. |date=June 11, 2017|title=Son of 'A Beautiful Mind' John Nash has one regret |url=https://www.nj.com/healthfit/2017/06/two_years_after_parents_death_son_of_a_beautiful_m.html |access-date=June 17, 2020 |website=NJ Advance Media|language=en}}</ref> In 1958, Nash was appointed to a tenured position at MIT, and his first signs of mental illness soon became evident. He resigned his position at MIT in the spring of 1959.<ref name="Nash1995" /> His son, John Charles Martin Nash, was born a few months later. The child was not named for a year<ref name = cs-slate-2001-12 /> because Alicia felt that Nash should have a say in choosing the name. Due to the stress of dealing with his illness, Nash and Lardé divorced in 1963. After his final hospital discharge in 1970, Nash lived in Lardé's house as a ]. This stability seemed to help him, and he learned how to consciously discard his paranoid ]s.<ref name='david'>, ''The New York Times'', June 11, 1998</ref> Princeton allowed him to audit classes. He continued to work on mathematics and was eventually allowed to teach again. In the 1990s, Lardé and Nash resumed their relationship, remarrying in 2001. John Charles Martin Nash earned a PhD in mathematics from ] and was diagnosed with ] as an adult.<ref name="charlesmartin" />

== Death ==
On May 23, 2015, Nash and his wife died in a car accident on the ] in ] while returning home from receiving the ] in Norway. The driver of the taxicab they were riding in from Newark Airport lost control of the cab and struck a guardrail. Because neither were wearing seatbelts, both passengers were ejected and killed.<ref></ref> At the time of his death, Nash was a longtime resident of New Jersey. He was survived by two sons, John Charles Martin Nash, who lived with his parents at the time of their death, and elder child John Stier.<ref>{{cite news |url=http://business.highbeam.com/62734/article-1P1-51401334/john-forbes-nash-may-lose-nj-home |archive-url=https://web.archive.org/web/20130518131511/http://business.highbeam.com/62734/article-1P1-51401334/john-forbes-nash-may-lose-nj-home |archive-date=May 18, 2013 |title=John Forbes Nash May Lose N.J. Home |agency=] |date=March 14, 2002 |quote=West Windsor, N.J.: John Forbes Nash Jr., whose life is chronicled in the Oscar-nominated movie ''A Beautiful Mind,'' could lose his home if the township picks one of its proposals to replace a nearby bridge. |access-date=February 22, 2011 |via=]}}</ref>

Following his death, obituaries appeared in scientific and popular media throughout the world. In addition to their obituary for Nash,<ref name="NYT death">{{cite news |first=Erica |last=Goode |url=https://www.nytimes.com/2015/05/25/science/john-nash-a-beautiful-mind-subject-and-nobel-winner-dies-at-86.html |title=John F. Nash Jr., Math Genius Defined by a 'Beautiful Mind,' Dies at 86 |work=] |date=May 24, 2015 |access-date=May 24, 2015}}</ref> '']'' published an article containing quotes from Nash that had been assembled from media and other published sources. The quotes consisted of Nash's reflections on his life and achievements.<ref name="NYT quotes">{{cite news |title=The Wisdom of a Beautiful Mind |url=https://www.nytimes.com/interactive/2015/05/25/science/john-nash-quotes.html |website=] |access-date=May 25, 2015 |date=May 24, 2015}}</ref>

== Legacy ==
At Princeton in the 1970s, Nash became known as "The Phantom of Fine Hall"<ref>{{cite news |last=Kwon |first=Ha Kyung |title=Nash GS '50: 'The Phantom of Fine Hall' |url=http://dailyprincetonian.com/news/2010/12/nash-gs-50-the-phantom-of-fine-hall/ |access-date=May 6, 2014 |newspaper=] |date=December 10, 2010 |archive-url=https://web.archive.org/web/20140506091547/http://dailyprincetonian.com/news/2010/12/nash-gs-50-the-phantom-of-fine-hall/ |archive-date=May 6, 2014 }}</ref> (Princeton's mathematics center), a shadowy figure who would scribble arcane equations on blackboards in the middle of the night.

He is referred to in a novel set at Princeton, ''The Mind-Body Problem'', 1983, by ].<ref name="Nasar1994">{{cite news |last1=Nasar |first1=Sylvia |author-link1=Sylvia Nasar |title=The Lost Years of a Nobel Laureate |url=https://www.nytimes.com/1994/11/13/business/the-lost-years-of-a-nobel-laureate.html |website=] |access-date=May 6, 2014 |location=Princeton, New Jersey |date=November 13, 1994}}</ref>

]'s biography of Nash, ''A Beautiful Mind'', was published in 1998. A ] was released in 2001, directed by ] with ] playing Nash; it won four ], including ]. For his performance as Nash, Crowe won the ] at the ] and the ] at the ]. Crowe was nominated for the ] at the ]; ] won for his performance in '']''.


== Awards == == Awards ==
* 1978&nbsp;– ] (with ])<ref>{{cite web|url=https://www.informs.org/Recognizing-Excellence/Award-Recipients/John-F.-Nash|title=John F. Nash|access-date=October 10, 2022|website=]}}</ref> "for their outstanding contributions to the theory of games"
* 1994&nbsp;– ]
* 1994&nbsp;– ] (with ] and ])<ref>{{cite web|url=https://www.nobelprize.org/prizes/lists/all-prizes-in-economic-sciences/|access-date=October 10, 2022|title=All prizes in economic sciences|website=The Nobel Prize}}</ref> "for their pioneering analysis of equilibria in the theory of non-cooperative games"
* 2010&nbsp;– ]<ref>{{cite web|title=John F. Nash, Jr. 2010 Honoree|url=http://www.cshl.edu/DHMD/2010-Honoree-John-F-Nash-Jr.html|accessdate=July 16, 2014}}</ref>
* 1999&nbsp;– ]<ref name="steele" /> for his 1956 paper "The imbedding problem for Riemannian manifolds"
* 2015&nbsp;– ]<ref>{{cite web|title=Nash receives Abel Prize for revered work in mathematics|url=http://www.princeton.edu/main/news/archive/S42/72/29C63/|accessdate=March 25, 2015}}</ref>
* 2002 class of ]s of the ]<ref>{{citation|url=https://www.informs.org/Recognizing-Excellence/Fellows/Fellows-Alphabetical-List|title=Fellows: Alphabetical List|publisher=]|access-date=October 9, 2019|archive-url=https://web.archive.org/web/20190510220119/https://www.informs.org/Recognizing-Excellence/Fellows/Fellows-Alphabetical-List|archive-date=May 10, 2019}}</ref>
* 2010&nbsp;– ]<ref>{{cite web |website=]|title=John F. Nash Jr.: 2010 Honoree |url=http://www.cshl.edu/DHMD/2010-Honoree-John-F-Nash-Jr.html |access-date=July 16, 2014 |archive-url=https://web.archive.org/web/20141017125106/http://www.cshl.edu/DHMD/2010-Honoree-John-F-Nash-Jr.html |archive-date=October 17, 2014 }}</ref>
* 2015&nbsp;– ] (with ])<ref>{{cite web |title=A 'long awaited recognition': Nash receives Abel Prize for revered work in mathematics|url=https://www.princeton.edu/main/news/archive/S42/72/29C63/|website=Princeton University|date=March 26, 2015 |access-date=October 10, 2022|last=Kelly|first=Morgan|department=Office of Communications}}</ref> "for striking and seminal contributions to the theory of nonlinear partial differential equations and its applications to geometric analysis"


== See also == == Documentaries and interviews ==
* {{cite episode|last=Wallace|first=Mike (host)|author-link1=Mike Wallace|date=March 17, 2002|network=]|series=60 Minutes|series-link=60 Minutes|season=34|number=26|title=John Nash's Beautiful Mind}}
* {{cite episode|title=A Brilliant Madness|url=https://www.pbs.org/wgbh/americanexperience/films/nash|access-date=October 11, 2022|series=American Experience|series-link=American Experience|network=]|date=April 28, 2002|transcript=Transcript|transcript-url=https://www.pbs.org/wgbh/americanexperience/films/nash/#transcript|last=Samels|first=Mark (director)}}
* {{cite interview|interviewer=Marika Griehsel|last=Nash|first=John|date=September 1–4, 2004|title=John F. Nash Jr.|publisher=Nobel Prize Outreach|url=https://www.nobelprize.org/prizes/economic-sciences/1994/nash/interview/}}
* {{cite interview|interviewer=]|last=Nash|first=John|date=December 5, 2009|title=One on One|publisher=]}} ({{YouTube|UiWBWwCa1E0|Part 1}}, {{YouTube|ufKIgW9XrCE|Part 2}})
* {{cite magazine|title=Interview with Abel Laureate John F. Nash Jr.|interviewer=Martin Raussen and Christian Skau|date=September 2015|magazine=Newsletter of the European Mathematical Society|volume=97|year=2015|pages=26–31|url=https://ems.press/content/serial-issue-files/13732|issn=1027-488X|mr=3409221}}


== Publication list ==
{{Portal | Mathematics | Biography}}
{{refbegin|30em}}
* ]
* {{cite journal|last1=Nash|last2=Nash|first1=John F.|first2=John F. Jr.|title=Sag and tension calculations for cable and wire spans using catenary formulas|volume=64|issue=10|pages=685–692|doi=10.1109/T-AIEE.1945.5059021|year=1945|journal=]|s2cid=51640174 }}
* ]
*{{cite journal|mr=0035977|last1=Nash|first1=John F. Jr.|title=The bargaining problem|journal=]|volume=18|year=1950a|pages=155–162|issue=2|doi=10.2307/1907266|jstor=1907266 |zbl=1202.91122|s2cid=153422092}}
*{{cite journal|mr=0031701|last1=Nash|first1=John F. Jr.|title=Equilibrium points in {{mvar|n}}-person games|journal=]|volume=36|year=1950b|pages=48–49|doi=10.1073/pnas.36.1.48|issue=1|pmid=16588946 |pmc=1063129 |bibcode=1950PNAS...36...48N |doi-access=free|zbl=0036.01104}}
*{{cite conference|mr=0039223|last1=Nash|first1=J. F.|last2=Shapley|first2=L. S.|author-link2=Lloyd Shapley|title=A simple three-person poker game|zbl=0041.25602|book-title=Contributions to the Theory of Games, Volume I|pages=105–116|series=Annals of Mathematics Studies|volume=24|publisher=]|location=Princeton, NJ|year=1950|doi=10.1515/9781400881727-011|editor-last1=Kuhn|editor-last2=Tucker|editor-first1=H. W.|editor-first2=A. W.|editor-link2=Albert W. Tucker|editor-link1=Harold W. Kuhn}}
*{{cite journal|mr=0043432|last1=Nash|first1=John|title=Non-cooperative games|journal=]|series=Second Series|volume=54|year=1951|pages=286–295|doi=10.2307/1969529|issue=2|jstor=1969529 |zbl=0045.08202}}
* {{cite conference|title=Algebraic approximations of manifolds|last1=Nash|first1=John|pages=516–517|url=https://www.mathunion.org/icm/proceedings|book-title=Proceedings of the International Congress of Mathematicians: Cambridge, Massachusetts, U. S. A., 1950. Volume I|year=1952a|location=Providence, RI|publisher=]|editor-first1=Lawrence M.|editor-last1=Graves|editor-first3=Paul A.|editor-last3=Smith|editor-first2=Einar|editor-last2=Hille|editor-first4=Oscar|editor-last4=Zariski|editor-link4=Oscar Zariski|editor-link2=Einar Hille|editor-link3=Paul Althaus Smith}}
* {{cite journal|mr=0050928|last1=Nash|first1=John|title=Real algebraic manifolds|journal=]|series=Second Series|volume=56|year=1952b|pages=405–421|issue=3|doi=10.2307/1969649|jstor=1969649 |zbl=0048.38501}}
* {{cite journal|mr=0053471|last1=Nash|first1=John|title=Two-person cooperative games|journal=]|volume=21|year=1953|pages=128–140|doi=10.2307/1906951|issue=1|jstor=1906951 |zbl=0050.14102}}
* {{cite journal|mr=3363438|last1=Mayberry|first1=J. P.|last2=Nash|first2=J. F.|last3=Shubik|first3=M.|author-link3=Martin Shubik|title=A comparison of treatments of a duopoly situation|journal=]|volume=21|year=1953|issue=1|pages=141–154|doi=10.2307/1906952|jstor=1906952 |zbl=0050.15104|s2cid=154750660 }}
* {{cite journal|mr=0065993|last1=Nash|first1=John|title=C<sup>1</sup> isometric imbeddings|journal=]|series=Second Series|volume=60|year=1954|pages=383–396|issue=3|doi=10.2307/1969840|jstor=1969840 |zbl=0058.37703}}
* {{cite conference|mr=3363439|last1=Kalisch|first1=G. K.|last2=Milnor|first2=J. W.|author-link2=John Milnor|last3=Nash|first3=J. F.|last4=Nering|first4=E. D.|title=Some experimental {{mvar|n}}-person games|book-title=Decision Processes|pages=301–327|publisher=]|location=New York|year=1954|zbl=0058.13904|editor-last1=Thrall|editor-last2=Coombs|editor-last3=Davis|editor-first1=R. M.|editor-first2=C. H.|editor-first3=R. L.|editor-link1=Robert M. Thrall|editor-link2=Clyde Coombs}}
* {{cite journal|mr=0071081|last1=Nash|first1=John|title=A path space and the Stiefel–Whitney classes|journal=]|volume=41|year=1955|pages=320–321|issue=5|doi=10.1073/pnas.41.5.320|pmid=16589673 |pmc=528087 |bibcode=1955PNAS...41..320N |doi-access=free|zbl=0064.17503}}
* {{cite journal|mr=0075639|last1=Nash|first1=John|title=The imbedding problem for Riemannian manifolds|journal=]|series=Second Series|volume=63|year=1956|pages=20–63|issue=1|doi=10.2307/1969989|jstor=1969989 |zbl=0070.38603}}
* {{cite journal|mr=0089986|last1=Nash|first1=John|title=Parabolic equations|journal=]|volume=43|year=1957|pages=754–758|issue=8|doi=10.1073/pnas.43.8.754|pmid=16590082 |pmc=528534 |bibcode=1957PNAS...43..754N |doi-access=free|zbl=0078.08704}}
* {{cite journal|mr=0100158|last1=Nash|first1=J.|title=Continuity of solutions of parabolic and elliptic equations|journal=]|volume=80|year=1958|pages=931–954|issue=4|doi=10.2307/2372841|jstor=2372841 |bibcode=1958AmJM...80..931N |zbl=0096.06902}}
* {{cite journal|mr=0149094|last1=Nash|first1=John|title=Le problème de Cauchy pour les équations différentielles d'un fluide général|journal=]|volume=90|year=1962|pages=487–497|zbl=0113.19405|doi=10.24033/bsmf.1586|doi-access=free}}
* {{cite journal|mr=0205266|last1=Nash|first1=J.|title=Analyticity of the solutions of implicit function problems with analytic data|journal=]|series=Second Series|volume=84|year=1966|pages=345–355|issue=3|doi=10.2307/1970448|jstor=1970448 |zbl=0173.09202}}
* {{cite journal|mr=1381967|last1=Nash|first1=John F. Jr.|title=Arc structure of singularities|journal=]|volume=81|year=1995|issue=1|pages=31–38|doi=10.1215/S0012-7094-95-08103-4|zbl=0880.14010}}
* {{cite journal|last1=Nash|first1=John|year=2002a|title=Ideal money|journal=]|volume=69|issue=1|pages=4–11|doi=10.2307/1061553|jstor=1061553 }}
* {{cite journal|mr=2510706|last1=Nash|first1=John F. Jr.|title=The agencies method for modeling coalitions and cooperation in games|journal=]|volume=10|year=2008|issue=4|pages=539–564|doi=10.1142/S0219198908002084|zbl=1178.91019}}
* {{cite conference|mr=2605109|last1=Nash|first1=John F.|title=Ideal money and asymptotically ideal money|book-title=Contributions to Game Theory and Management. Volume II|pages=281–293|publisher=Graduate School of Management, ]|location=St. Petersburg|year=2009a|zbl=1184.91147|isbn=978-5-9924-0020-5|editor-first1=Leon A.|editor-last1=Petrosjan|editor-first2=Nikolay A.|editor-last2=Zenkevich|editor-link1=Leon Petrosyan}}
* {{cite journal|mr=2642155|last1=Nash|first1=John F.|title=Studying cooperative games using the method of agencies|journal=International Journal of Mathematics, Game Theory, and Algebra|volume=18|year=2009b|issue=4–5|pages=413–426|zbl=1293.91015}}
* {{cite journal|last1=Nash|first1=John F. Jr.|last2=Nagel|first2=Rosemarie|author2-link=Rosemarie Nagel|last3=Ockenfels|first3=Axel|last4=Selten|first4=Reinhard|title=The agencies method for coalition formation in experimental games|journal=]|volume=109|issue=50|year=2012|pages=20358–20363|doi=10.1073/pnas.1216361109|pmid=23175792 |pmc=3528550 |bibcode=2012PNAS..10920358N |doi-access=free|author-link4=Reinhard Selten|author-link3=Axel Ockenfels}}
* {{cite book |editor-last1=Nash | editor-first1=John Forbes Jr. | editor-last2=Rassias | editor-first2=Michael Th. | title=Open problems in mathematics|title-link=Open Problems in Mathematics | publisher=]|location=New York | year=2016|mr=3470099|isbn=978-3-319-32160-8|doi=10.1007/978-3-319-32162-2|zbl=1351.00027}}
{{refend}}
Four of Nash's game-theoretic papers {{harvs|last=Nash|year=1950a|year2=1950b|year3=1951|year4=1953}} and three of his ] papers {{harvs|last=Nash|year=1952b|year2=1956|year3=1958}} were collected in the following:
* {{cite encyclopedia|mr=1888522|title=The essential John Nash|editor-first1=Harold W.|editor-last1=Kuhn|editor-first2=Sylvia|editor-last2=Nasar|publisher=]|location=Princeton, NJ|year=2002|isbn=0-691-09527-2|doi=10.1515/9781400884087|editor-link1=Harold Kuhn|editor-link2=Sylvia Nasar|zbl=1033.01024}}


== References == == References ==
{{Reflist|30em}} {{Reflist}}


== Bibliography == == Bibliography ==
* {{cite book|last=Nasar|first=Sylvia|author-link=Sylvia Nasar|title=A Beautiful Mind|url=https://archive.org/details/beautifulmind00sylv|url-access=registration|year=1998|publisher=]|isbn=978-1-4391-2649-3|location=New York}}
* ] and Di Bartolomeo, Giovanni (2006), ‘''Tinbergen and Theil meet Nash: controllability in policy games''’, in: ‘''Economics Letters''’, 90(2): 213–218.
* {{cite book|last=Nasar|first=Sylvia|author-link=Sylvia Nasar|editor-last=Kuhn|editor-first=Harold W.|editor-link=Harold W. Kuhn|title=The Essential John Nash|chapter-url=https://archive.org/details/essentialjohnnas00john|chapter-url-access=registration|year=2002|publisher=]|isbn=978-0-691-09610-0|ref=SNasar|pages=xi–xxv|jstor=j.ctt1c3gwz0|chapter=Introduction|location=Princeton}}
* ] and Di Bartolomeo, G. and Piacquadio, P.G. , ‘''Conflict of interest, (implicit) coalitions and Nash policy games''’, in: ‘''Economics Letters''’, 105: 303–305.
* {{cite book|title=A Beautiful Mind|year=1998|publisher=Simon and Schuster|isbn=9781439126493|author=Nasar, Sylvia|ref=Nasar}} * {{cite book|last=Siegfried|first=Tom|title=A Beautiful Math|year=2006|publisher=]|isbn=978-0-309-10192-9|location=Washington, D.C.}}
* {{MacTutor Biography|id=Nash}} * {{MacTutor|id=Nash}}

== Documentaries and video interviews ==
* ""&nbsp;– a ] ''American Experience'' documentary
* ''One on One – Professor John Nash''. Al Jazeera English, 2009-12-05 ({{YouTube|UiWBWwCa1E0|part 1}}, {{YouTube|ufKIgW9XrCE|part 2}})


== External links == == External links ==
{{sisterlinks|d=Q128736|commons=category:John Forbes Nash|m=no|mw=no|species=no|voy=no|s=no|wikt=no|n=no|b=no|v=no}} {{Sister project links|d=Q128736|commons=category:John Forbes Nash|m=no|mw=no|species=no|voy=no|s=no|wikt=no|n=no|b=no|v=no}}
*
* at the ] website
* {{MathGenealogy|id=18590}}
*
* *
*
* 2002 '']'' article by ], about Nash's work and world government * 2002 '']'' article by ], about Nash's work and world government
* for public viewing, 2012 * {{Webarchive|url=https://web.archive.org/web/20120219190420/http://www.nsa.gov/public_info/press_room/2012/nash_exhibit.shtml |date=February 19, 2012 }} to ] for public viewing, 2012
* {{cite book |title=John F. Nash Jr. (1928– ) |url=http://www.econlib.org/library/Enc/bios/Nash.html |work=] |edition=2nd |series=] |publisher=] |year=2008 }} * {{cite encyclopedia |title=John F. Nash Jr. (1928–2015) |url=http://www.econlib.org/library/Enc/bios/Nash.html |encyclopedia=] |edition=2nd |series=] |publisher=] |year=2016}}
* from Princeton's Mudd Library, including a copy of ] * from Princeton's Mudd Library, including a copy of ]
* from the Institute for Operations Research and the Management Sciences
* {{Nobelprize|namn=John F. Nash Jr.}}


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{{DEFAULTSORT:Nash, John Forbes Jr.}}
{{Persondata <!-- Metadata: see ] -->
|NAME = Nash, John Forbes, Jr.
|ALTERNATIVE NAMES =
|SHORT DESCRIPTION = American mathematician
|DATE OF BIRTH = June 13, 1928
|PLACE OF BIRTH = Bluefield, West Virginia, United States
|DATE OF DEATH = May 23, 2015
|PLACE OF DEATH = New Jersey, United States
}}
{{DEFAULTSORT:Nash, John Forbes}}
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Latest revision as of 00:15, 9 January 2025

American mathematician (1928–2015)

John Forbes Nash Jr.
Nash in the 2000s
Born(1928-06-13)June 13, 1928
Bluefield, West Virginia, U.S.
DiedMay 23, 2015(2015-05-23) (aged 86)
Monroe Township, New Jersey, U.S.
Education
Known for
Spouses
Children2
Awards
Scientific career
Fields
Institutions
ThesisNon-Cooperative Games (1950)
Doctoral advisorAlbert W. Tucker

John Forbes Nash, Jr. (June 13, 1928 – May 23, 2015), known and published as John Nash, was an American mathematician who made fundamental contributions to game theory, real algebraic geometry, differential geometry, and partial differential equations. Nash and fellow game theorists John Harsanyi and Reinhard Selten were awarded the 1994 Nobel Prize in Economics. In 2015, he and Louis Nirenberg were awarded the Abel Prize for their contributions to the field of partial differential equations.

As a graduate student in the Princeton University Department of Mathematics, Nash introduced a number of concepts (including Nash equilibrium and the Nash bargaining solution) which are now considered central to game theory and its applications in various sciences. In the 1950s, Nash discovered and proved the Nash embedding theorems by solving a system of nonlinear partial differential equations arising in Riemannian geometry. This work, also introducing a preliminary form of the Nash–Moser theorem, was later recognized by the American Mathematical Society with the Leroy P. Steele Prize for Seminal Contribution to Research. Ennio De Giorgi and Nash found, with separate methods, a body of results paving the way for a systematic understanding of elliptic and parabolic partial differential equations. Their De Giorgi–Nash theorem on the smoothness of solutions of such equations resolved Hilbert's nineteenth problem on regularity in the calculus of variations, which had been a well-known open problem for almost sixty years.

In 1959, Nash began showing clear signs of mental illness, and spent several years at psychiatric hospitals being treated for schizophrenia. After 1970, his condition slowly improved, allowing him to return to academic work by the mid-1980s.

Nash's life was the subject of Sylvia Nasar's 1998 biographical book A Beautiful Mind, and his struggles with his illness and his recovery became the basis for a film of the same name directed by Ron Howard, in which Nash was portrayed by Russell Crowe.

Early life and education

John Forbes Nash Jr. was born on June 13, 1928, in Bluefield, West Virginia. His father and namesake, John Forbes Nash Sr., was an electrical engineer for the Appalachian Electric Power Company. His mother, Margaret Virginia (née Martin) Nash, had been a schoolteacher before she was married. He was baptized in the Episcopal Church. He had a younger sister, Martha (born November 16, 1930).

Nash attended kindergarten and public school, and he learned from books provided by his parents and grandparents. Nash's parents pursued opportunities to supplement their son's education, and arranged for him to take advanced mathematics courses at nearby Bluefield College (now Bluefield University) during his final year of high school. He attended Carnegie Institute of Technology (which later became Carnegie Mellon University) through a full benefit of the George Westinghouse Scholarship, initially majoring in chemical engineering. He switched to a chemistry major and eventually, at the advice of his teacher John Lighton Synge, to mathematics. After graduating in 1948, with both a B.S. and M.S. in mathematics, Nash accepted a fellowship to Princeton University, where he pursued further graduate studies in mathematics and sciences.

Nash's adviser and former Carnegie professor Richard Duffin wrote a letter of recommendation for Nash's entrance to Princeton stating, "He is a mathematical genius." Nash was also accepted at Harvard University. However, the chairman of the mathematics department at Princeton, Solomon Lefschetz, offered him the John S. Kennedy fellowship, convincing Nash that Princeton valued him more. Further, he considered Princeton more favorably because of its proximity to his family in Bluefield. At Princeton, he began work on his equilibrium theory, later known as the Nash equilibrium.

Research contributions

Nash in November 2006 at a game theory conference in Cologne, Germany

Nash did not publish extensively, although many of his papers are considered landmarks in their fields. As a graduate student at Princeton, he made foundational contributions to game theory and real algebraic geometry. As a postdoctoral fellow at MIT, Nash turned to differential geometry. Although the results of Nash's work on differential geometry are phrased in a geometrical language, the work is almost entirely to do with the mathematical analysis of partial differential equations. After proving his two isometric embedding theorems, Nash turned to research dealing directly with partial differential equations, where he discovered and proved the De Giorgi–Nash theorem, thereby resolving one form of Hilbert's nineteenth problem.

In 2011, the National Security Agency declassified letters written by Nash in the 1950s, in which he had proposed a new encryption–decryption machine. The letters show that Nash had anticipated many concepts of modern cryptography, which are based on computational hardness.

Game theory

Nash earned a PhD in 1950 with a 28-page dissertation on non-cooperative games. The thesis, written under the supervision of doctoral advisor Albert W. Tucker, contained the definition and properties of the Nash equilibrium, a crucial concept in non-cooperative games. A version of his thesis was published a year later in the Annals of Mathematics. In the early 1950s, Nash carried out research on a number of related concepts in game theory, including the theory of cooperative games. For his work, Nash was one of the recipients of the Nobel Memorial Prize in Economic Sciences in 1994.

Real algebraic geometry

In 1949, while still a graduate student, Nash found a new result in the mathematical field of real algebraic geometry. He announced his theorem in a contributed paper at the International Congress of Mathematicians in 1950, although he had not yet worked out the details of its proof. Nash's theorem was finalized by October 1951, when Nash submitted his work to the Annals of Mathematics. It had been well-known since the 1930s that every closed smooth manifold is diffeomorphic to the zero set of some collection of smooth functions on Euclidean space. In his work, Nash proved that those smooth functions can be taken to be polynomials. This was widely regarded as a surprising result, since the class of smooth functions and smooth manifolds is usually far more flexible than the class of polynomials. Nash's proof introduced the concepts now known as Nash function and Nash manifold, which have since been widely studied in real algebraic geometry. Nash's theorem itself was famously applied by Michael Artin and Barry Mazur to the study of dynamical systems, by combining Nash's polynomial approximation together with Bézout's theorem.

Differential geometry

During his postdoctoral position at MIT, Nash was eager to find high-profile mathematical problems to study. From Warren Ambrose, a differential geometer, he learned about the conjecture that any Riemannian manifold is isometric to a submanifold of Euclidean space. Nash's results proving the conjecture are now known as the Nash embedding theorems, the second of which Mikhael Gromov has called "one of the main achievements of mathematics of the twentieth century".

Nash's first embedding theorem was found in 1953. He found that any Riemannian manifold can be isometrically embedded in a Euclidean space by a continuously differentiable mapping. Nash's construction allows the codimension of the embedding to be very small, with the effect that in many cases it is logically impossible that a highly-differentiable isometric embedding exists. (Based on Nash's techniques, Nicolaas Kuiper soon found even smaller codimensions, with the improved result often known as the Nash–Kuiper theorem.) As such, Nash's embeddings are limited to the setting of low differentiability. For this reason, Nash's result is somewhat outside the mainstream in the field of differential geometry, where high differentiability is significant in much of the usual analysis.

However, the logic of Nash's work has been found to be useful in many other contexts in mathematical analysis. Starting with work of Camillo De Lellis and László Székelyhidi, the ideas of Nash's proof were applied for various constructions of turbulent solutions of the Euler equations in fluid mechanics. In the 1970s, Mikhael Gromov developed Nash's ideas into the general framework of convex integration, which has been (among other uses) applied by Stefan Müller and Vladimír Šverák to construct counterexamples to generalized forms of Hilbert's nineteenth problem in the calculus of variations.

Nash found the construction of smoothly differentiable isometric embeddings to be unexpectedly difficult. However, after around a year and a half of intensive work, his efforts succeeded, thereby proving the second Nash embedding theorem. The ideas involved in proving this second theorem are largely separate from those used in proving the first. The fundamental aspect of the proof is an implicit function theorem for isometric embeddings. The usual formulations of the implicit function theorem are inapplicable, for technical reasons related to the loss of regularity phenomena. Nash's resolution of this issue, given by deforming an isometric embedding by an ordinary differential equation along which extra regularity is continually injected, is regarded as a fundamentally novel technique in mathematical analysis. Nash's paper was awarded the Leroy P. Steele Prize for Seminal Contribution to Research in 1999, where his "most original idea" in the resolution of the loss of regularity issue was cited as "one of the great achievements in mathematical analysis in this century". According to Gromov:

You must be a novice in analysis or a genius like Nash to believe anything like that can be ever true and/or to have a single nontrivial application.

Due to Jürgen Moser's extension of Nash's ideas for application to other problems (notably in celestial mechanics), the resulting implicit function theorem is known as the Nash–Moser theorem. It has been extended and generalized by a number of other authors, among them Gromov, Richard Hamilton, Lars Hörmander, Jacob Schwartz, and Eduard Zehnder. Nash himself analyzed the problem in the context of analytic functions. Schwartz later commented that Nash's ideas were "not just novel, but very mysterious," and that it was very hard to "get to the bottom of it." According to Gromov:

Nash was solving classical mathematical problems, difficult problems, something that nobody else was able to do, not even to imagine how to do it. ...  what Nash discovered in the course of his constructions of isometric embeddings is far from 'classical' – it is something that brings about a dramatic alteration of our understanding of the basic logic of analysis and differential geometry. Judging from the classical perspective, what Nash has achieved in his papers is as impossible as the story of his life ... is work on isometric immersions ... opened a new world of mathematics that stretches in front of our eyes in yet unknown directions and still waits to be explored.

Partial differential equations

While spending time at the Courant Institute in New York City, Louis Nirenberg informed Nash of a well-known conjecture in the field of elliptic partial differential equations. In 1938, Charles Morrey had proved a fundamental elliptic regularity result for functions of two independent variables, but analogous results for functions of more than two variables had proved elusive. After extensive discussions with Nirenberg and Lars Hörmander, Nash was able to extend Morrey's results, not only to functions of more than two variables, but also to the context of parabolic partial differential equations. In his work, as in Morrey's, uniform control over the continuity of the solutions to such equations is achieved, without assuming any level of differentiability on the coefficients of the equation. The Nash inequality was a particular result found in the course of his work (the proof of which Nash attributed to Elias Stein), which has been found useful in other contexts.

Soon after, Nash learned from Paul Garabedian, recently returned from Italy, that the then-unknown Ennio De Giorgi had found nearly identical results for elliptic partial differential equations. De Giorgi and Nash's methods had little to do with one another, although Nash's were somewhat more powerful in applying to both elliptic and parabolic equations. A few years later, inspired by De Giorgi's method, Jürgen Moser found a different approach to the same results, and the resulting body of work is now known as the De Giorgi–Nash theorem or the De Giorgi–Nash–Moser theory (which is distinct from the Nash–Moser theorem). De Giorgi and Moser's methods became particularly influential over the next several years, through their developments in the works of Olga Ladyzhenskaya, James Serrin, and Neil Trudinger, among others. Their work, based primarily on the judicious choice of test functions in the weak formulation of partial differential equations, is in strong contrast to Nash's work, which is based on analysis of the heat kernel. Nash's approach to the De Giorgi–Nash theory was later revisited by Eugene Fabes and Daniel Stroock, initiating the re-derivation and extension of the results originally obtained from De Giorgi and Moser's techniques.

From the fact that minimizers to many functionals in the calculus of variations solve elliptic partial differential equations, Hilbert's nineteenth problem (on the smoothness of these minimizers), conjectured almost sixty years prior, was directly amenable to the De Giorgi–Nash theory. Nash received instant recognition for his work, with Peter Lax describing it as a "stroke of genius". Nash would later speculate that had it not been for De Giorgi's simultaneous discovery, he would have been a recipient of the prestigious Fields Medal in 1958. Although the medal committee's reasoning is not fully known, and was not purely based on questions of mathematical merit, archival research has shown that Nash placed third in the committee's vote for the medal, after the two mathematicians (Klaus Roth and René Thom) who were awarded the medal that year.

Mental illness

Although Nash's mental illness first began to manifest in the form of paranoia, his wife later described his behavior as erratic. Nash thought that all men who wore red ties were part of a communist conspiracy against him. He mailed letters to embassies in Washington, D.C., declaring that they were establishing a government. Nash's psychological issues crossed into his professional life when he gave an American Mathematical Society lecture at Columbia University in early 1959. Originally intended to present proof of the Riemann hypothesis, the lecture was incomprehensible. Colleagues in the audience immediately realized that something was wrong.

In April 1959, Nash was admitted to McLean Hospital for one month. Based on his paranoid, persecutory delusions, hallucinations, and increasing asociality, he was diagnosed with schizophrenia. In 1961, Nash was admitted to the New Jersey State Hospital at Trenton. Over the next nine years, he spent intervals of time in psychiatric hospitals, where he received both antipsychotic medications and insulin shock therapy.

Although he sometimes took prescribed medication, Nash later wrote that he did so only under pressure. According to Nash, the film A Beautiful Mind inaccurately implied he was taking atypical antipsychotics. He attributed the depiction to the screenwriter who was worried about the film encouraging people with mental illness to stop taking their medication.

Nash did not take any medication after 1970, nor was he committed to a hospital ever again. Nash recovered gradually. Encouraged by his then former wife, Lardé, Nash lived at home and spent his time in the Princeton mathematics department where his eccentricities were accepted even when his mental condition was poor. Lardé credits his recovery to maintaining "a quiet life" with social support.

Nash dated the start of what he termed "mental disturbances" to the early months of 1959, when his wife was pregnant. He described a process of change "from scientific rationality of thinking into the delusional thinking characteristic of persons who are psychiatrically diagnosed as 'schizophrenic' or 'paranoid schizophrenic'". For Nash, this included seeing himself as a messenger or having a special function of some kind, of having supporters and opponents and hidden schemers, along with a feeling of being persecuted and searching for signs representing divine revelation. During his psychotic phase, Nash also referred to himself in the third person as "Johann von Nassau". Nash suggested his delusional thinking was related to his unhappiness, his desire to be recognized, and his characteristic way of thinking, saying, "I wouldn't have had good scientific ideas if I had thought more normally." He also said, "If I felt completely pressureless I don't think I would have gone in this pattern".

Nash reported that he started hearing voices in 1964, then later engaged in a process of consciously rejecting them. He only renounced his "dream-like delusional hypotheses" after a prolonged period of involuntary commitment in mental hospitals—"enforced rationality". Upon doing so, he was temporarily able to return to productive work as a mathematician. By the late 1960s, he relapsed. Eventually, he "intellectually rejected" his "delusionally influenced" and "politically oriented" thinking as a waste of effort. In 1995, he said that he did not realize his full potential due to nearly 30 years of mental illness.

Nash wrote in 1994:

I spent times of the order of five to eight months in hospitals in New Jersey, always on an involuntary basis and always attempting a legal argument for release. And it did happen that when I had been long enough hospitalized that I would finally renounce my delusional hypotheses and revert to thinking of myself as a human of more conventional circumstances and return to mathematical research. In these interludes of, as it were, enforced rationality, I did succeed in doing some respectable mathematical research. Thus there came about the research for "Le problème de Cauchy pour les équations différentielles d'un fluide général"; the idea that Prof. Heisuke Hironaka called "the Nash blowing-up transformation"; and those of "Arc Structure of Singularities" and "Analyticity of Solutions of Implicit Function Problems with Analytic Data".

But after my return to the dream-like delusional hypotheses in the later 60s I became a person of delusionally influenced thinking but of relatively moderate behavior and thus tended to avoid hospitalization and the direct attention of psychiatrists.

Thus further time passed. Then gradually I began to intellectually reject some of the delusionally influenced lines of thinking which had been characteristic of my orientation. This began, most recognizably, with the rejection of politically oriented thinking as essentially a hopeless waste of intellectual effort. So at the present time I seem to be thinking rationally again in the style that is characteristic of scientists.

Recognition and later career

Nash pictured in 2011

In 1978, Nash was awarded the John von Neumann Theory Prize for his discovery of non-cooperative equilibria, now called Nash Equilibria. He won the Leroy P. Steele Prize in 1999.

In 1994, he received the Nobel Memorial Prize in Economic Sciences (along with John Harsanyi and Reinhard Selten) for his game theory work as a Princeton graduate student. In the late 1980s, Nash had begun to use email to gradually link with working mathematicians who realized that he was the John Nash and that his new work had value. They formed part of the nucleus of a group that contacted the Bank of Sweden's Nobel award committee and were able to vouch for Nash's mental health and ability to receive the award.

Nash's later work involved ventures in advanced game theory, including partial agency, which show that, as in his early career, he preferred to select his own path and problems. Between 1945 and 1996, he published 23 scientific papers.

Nash has suggested hypotheses on mental illness. He has compared not thinking in an acceptable manner, or being "insane" and not fitting into a usual social function, to being "on strike" from an economic point of view. He advanced views in evolutionary psychology about the potential benefits of apparently nonstandard behaviors or roles.

Nash criticized Keynesian ideas of monetary economics which allowed for a central bank to implement monetary policies. He proposed a standard of "Ideal Money" pegged to an "industrial consumption price index" which was more stable than "bad money." He noted that his thinking on money and the function of monetary authority paralleled that of economist Friedrich Hayek.

Nash received an honorary degree, Doctor of Science and Technology, from Carnegie Mellon University in 1999, an honorary degree in economics from the University of Naples Federico II in 2003, an honorary doctorate in economics from the University of Antwerp in 2007, an honorary doctorate of science from the City University of Hong Kong in 2011, and was keynote speaker at a conference on game theory. Nash also received honorary doctorates from two West Virginia colleges: the University of Charleston in 2003 and West Virginia University Tech in 2006. He was a prolific guest speaker at a number of events, such as the Warwick Economics Summit in 2005, at the University of Warwick.

Nash was elected to the American Philosophical Society in 2006 and became a fellow of the American Mathematical Society in 2012.

On May 19, 2015, a few days before his death, Nash, along with Louis Nirenberg, was awarded the 2015 Abel Prize by King Harald V of Norway at a ceremony in Oslo.

Personal life

In 1951, the Massachusetts Institute of Technology (MIT) hired Nash as a C. L. E. Moore instructor in the mathematics faculty. About a year later, Nash began a relationship with Eleanor Stier, a nurse he met while admitted as a patient. They had a son, John David Stier, but Nash left Stier when she told him of her pregnancy. The film based on Nash's life, A Beautiful Mind, was criticized during the run-up to the 2002 Oscars for omitting this aspect of his life. He was said to have abandoned her based on her social status, which he thought to have been beneath his.

In Santa Monica, California, in 1954, while in his twenties, Nash was arrested for indecent exposure in a sting operation targeting gay men. Although the charges were dropped, he was stripped of his top-secret security clearance and fired from RAND Corporation, where he had worked as a consultant.

Not long after breaking up with Stier, Nash met Alicia Lardé Lopez-Harrison, a naturalized U.S. citizen from El Salvador. Lardé was graduated from MIT, having majored in physics. They married in February 1957. Although Nash was an atheist, the ceremony was performed in an Episcopal church. In 1958, Nash was appointed to a tenured position at MIT, and his first signs of mental illness soon became evident. He resigned his position at MIT in the spring of 1959. His son, John Charles Martin Nash, was born a few months later. The child was not named for a year because Alicia felt that Nash should have a say in choosing the name. Due to the stress of dealing with his illness, Nash and Lardé divorced in 1963. After his final hospital discharge in 1970, Nash lived in Lardé's house as a boarder. This stability seemed to help him, and he learned how to consciously discard his paranoid delusions. Princeton allowed him to audit classes. He continued to work on mathematics and was eventually allowed to teach again. In the 1990s, Lardé and Nash resumed their relationship, remarrying in 2001. John Charles Martin Nash earned a PhD in mathematics from Rutgers University and was diagnosed with schizophrenia as an adult.

Death

On May 23, 2015, Nash and his wife died in a car accident on the New Jersey Turnpike in Monroe Township, New Jersey while returning home from receiving the Abel Prize in Norway. The driver of the taxicab they were riding in from Newark Airport lost control of the cab and struck a guardrail. Because neither were wearing seatbelts, both passengers were ejected and killed. At the time of his death, Nash was a longtime resident of New Jersey. He was survived by two sons, John Charles Martin Nash, who lived with his parents at the time of their death, and elder child John Stier.

Following his death, obituaries appeared in scientific and popular media throughout the world. In addition to their obituary for Nash, The New York Times published an article containing quotes from Nash that had been assembled from media and other published sources. The quotes consisted of Nash's reflections on his life and achievements.

Legacy

At Princeton in the 1970s, Nash became known as "The Phantom of Fine Hall" (Princeton's mathematics center), a shadowy figure who would scribble arcane equations on blackboards in the middle of the night.

He is referred to in a novel set at Princeton, The Mind-Body Problem, 1983, by Rebecca Goldstein.

Sylvia Nasar's biography of Nash, A Beautiful Mind, was published in 1998. A film by the same name was released in 2001, directed by Ron Howard with Russell Crowe playing Nash; it won four Academy Awards, including Best Picture. For his performance as Nash, Crowe won the Golden Globe Award for Best Actor – Motion Picture Drama at the 59th Golden Globe Awards and the BAFTA Award for Best Actor at the 55th British Academy Film Awards. Crowe was nominated for the Academy Award for Best Actor at the 74th Academy Awards; Denzel Washington won for his performance in Training Day.

Awards

Documentaries and interviews

Publication list

Four of Nash's game-theoretic papers (Nash 1950a, 1950b, 1951, 1953) and three of his pure mathematics papers (Nash 1952b, 1956, 1958) were collected in the following:

References

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Bibliography

External links

Awards
Preceded byRobert W. Fogel
Douglass C. North
Laureate of the Nobel Memorial Prize in Economics
1994
Served alongside: John C. Harsanyi, Reinhard Selten
Succeeded byRobert E. Lucas Jr.
Laureates of the Sveriges Riksbank Prize in Economic Sciences
1969–1975
1976–2000
2001–present
Abel Prize laureates
John von Neumann Theory Prize
1975–1999
2000–present
Categories: