1. Prove: For all sets A and B, if A is a subset of B, then not B is a subset of not A. 2. Prove: For all sets A,B,and C, A - (B U C) = (A-B) and (A-C)
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#1 is really only about logic. Recall that . Thus “If x is in A then x is in B.” is equivalent to “If xi is not in B then x is not in A”. #2
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