Prove the remaining unproven parts of Theorem 3.13.(a) A(BC) = (AB)C(b) A(B + C) = AB +
Chapter 3, Problem 50(choose chapter or problem)
Prove the remaining unproven parts of Theorem 3.13.(a) A(BC) = (AB)C(b) A(B + C) = AB + AC(d) s(AB) = (s A)B = A(s B)(f) I A = A
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