Prove that if a : S -+ T and A and B are subsets of S, then a(A U B) = a(A) U a(B)
Chapter 1, Problem 1.27(choose chapter or problem)
Prove that if a : S -+ T and A and B are subsets of S, then a(A U B) = a(A) U a(B). (SeeAppendix B for half of the proof.)
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