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Robert Henry Sorgenfrey (August 14, 1915 – January 7, 1996) was an American mathematician and Professor Emeritus of Mathematics at the University of California, Los Angeles. The Sorgenfrey line and the Sorgenfrey plane are named after him; the Sorgenfrey line was the first example of a normal topological space whose product with itself is not normal.

References

1. Iowa County Births: Robert Henry Sorgenfrey
2. California Death Index: Robert Henry Sorgenfrey
3. Robert Sorgenfrey at the Mathematics Genealogy Project
4. "Robert Sorgenfrey". www.senate.ucla.edu. Archived from the original on 2000-08-24.

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