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  3. just need question c...

Question: just need question c...

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(3) Let (S, R) be a partially ordered set. A subset T s ry x, y є s, rd closed if for every x, y ES,xeT is upward closed if for eve x є T and xRy imply y є T. A subset T s is dountua and yRx imply y e T. Prove the statements below. (a) If T,T SS are upward closed, then TUT is upward closed. (b) If T, T, Ç S are upward closed, then T n T, is upward closed. c) IfTS S is upward closed, then T (the completement of T) is downward closed. just need question c

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