a. For an arbitrary set A, what is A ! A What is [ ! A b.
Chapter 4, Problem 80(choose chapter or problem)
a. For an arbitrary set A, what is A ! A? What is [ ! A? b. Prove that A ! B = B ! A for arbitrary sets A and B. c. For any sets A, B, and C, prove that (A ! B) ! C = A ! (B ! C ).
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