Derive the set identity A (A B) = A from the properties listed in Theorem 6.2.2(1)(9)

Chapter 6, Problem 53

(choose chapter or problem)

Derive the set identity \(A \cup(A \cap B)=A\) from the properties listed in Theorem 6.2.2(1)–(9). Start by showing that for all subsets B of a universal set U, \(U \cup B=U\). Then intersect both sides with A and deduce the identity.

Text Transcription:

A cup(A cap B)=A

U cup B=U

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