Prove the remaining unproven parts of Theorem 3.11.(a) A + B = B + A(b) s(A + B) = s A +
Chapter 3, Problem 49(choose chapter or problem)
Prove the remaining unproven parts of Theorem 3.11.(a) A + B = B + A(b) s(A + B) = s A + s B(c) (s + t)A = s A + t A(d) (A + B) + C = A + (B + C)(f) A + 0nm = A
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