Question: Let S be a nonempty set and let A and B be elements of the power set of S . In the partially ordered set

Let S be a nonempty set and let A and B be elements of
the power set of S. In the partially ordered set (P(S),sube),
(a)BB prove that A??B=AB;
(b) prove that AvvB=AB.
Let S be a nonempty set and let A and B be

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