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OpenStudy (anonymous):
Let U be any set. Prove that for every A∈P(U) there is a unique B∈P(U) such that for every c∈P(U), C\A=C∩B.
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OpenStudy (anonymous):
What does "P(U)" represent? The power set of U? And are A,B,C then subsets of U, so they're elements of the power set?
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