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Let A and B be sets. Prove that A = B if and only if A is a set of B and B is a set of A.?

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  • Let A and B be sets. Prove that A = B if and only if A is a set of B and B is a set of A.?


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Answer #1 | 08/02 2014 10:30
you can use Galois Theory for that.

Possible answer