Math 58 - Number Theory
(Most of these exercises are from the text, App. A, 1.3, or 1.5.) Prove rigorously using only the axioms in Appendix A: 1. If a and b are integers, then (–a)(–b) = ab. First: If a and b are any integers, then a(-b) = -(ab). Proof: “-(ab)” is, by definition, the unique number x that solves. ab + x = 0. ................
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