Let A be a nonempty set and let f: A-->B be a function. Prove that f is one-to-one iff there exists a function g: B-->A such that gof = 1(subA).

Can someone please show me how this is solved.

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- Feb 1st 2009, 05:13 PM #1

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- Feb 1st 2009, 05:29 PM #2

- Feb 1st 2009, 05:45 PM #3

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- Feb 1st 2009, 06:09 PM #4