I have this problem as homework, I don't think they're equal, but i need to prove it. Any body can help?

" If X and Y are sets and it is known that the collection of subsets of X equals the collection of Subsets of Y, can one conclude that X=Y?"

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- May 4th 2008, 09:11 AMvaviprove equal sets
I have this problem as homework, I don't think they're equal, but i need to prove it. Any body can help?

" If X and Y are sets and it is known that the collection of subsets of X equals the collection of Subsets of Y, can one conclude that X=Y?" - May 4th 2008, 09:27 AMIsomorphism