Solved: Find the mistake in the following proof that for
Chapter 6, Problem 6.75(choose chapter or problem)
Find the mistake in the following proof that for all sets A and B,(A B)(A B) A. Proof: Suppose A and B are sets, and suppose x (A B)(A B). Ifx A then x A B. Then, by denition of difference, x A and x / B. Hence x A,and so (A B)(A B) A by denition of subset.
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