i need to prove that next three arguments are equivalent:(adsbygoogle = window.adsbygoogle || []).push({});

1)f:X->Y is on Y.

2) f:p(X)->p(Y) is on p(Y).

3)f^-1:p(Y)->p(X) is one-to-one correspondence.

where p is the power set.

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# Homework Help: A question in set theory

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