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| #REDIRECT ] | |||
| An '''inverse image''' in ] is defined in the following way: | |||
| {{R to section}} | |||
| Consider a ] f which maps from some ] A to some ] B. | |||
| Let C be a ] of B, then the ''inverse image'' of C under the ] f, written f<sup>−1</sup>(C), is defined as the ] of all ] in A which map into C. | |||
| Example: | |||
| Take as ] A and B the ] 1, 2, 3,... Take as ] f the ] that assigns to every ] its ]. Take as ] C of B all ] less than 10. Then the ''inverse image'' of C consists of the ] 1, 2 and 3, since only these ] have have a ] less than 10, namely 1, 4 and 9. | |||
Latest revision as of 09:44, 29 April 2018
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