(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Let f be a function on A onto B where B is a subset of A, and f is a one-to-one function.

Now, I want to show that B can't be a proper subset of A( that is, not B[itex]\subset[/itex]A. this means B=A).

2. Relevant equations

3. The attempt at a solution

I attempted to solve this problem. Even though it is not complicated problem, but I don't have an idea how to prove it.

Could you give me a clue or something??

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# Homework Help: Show that B can't be a proper subset of A

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