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gotjrgkr
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Homework Statement
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).
Homework Equations
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??