Question: If U is a given universe with (fixed) S, T U, define g: P(U) SP(U) by g(A) = T D (5 U A) for

If °U is a given universe with (fixed) S, T ⊂ °U, define g: P(U) SP(U) by g(A) = T D (5 U A) for A c °ll. Prove that g2 = g.

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