Each of the statements is true. For each, (a) rewrite the statement with the quantification implicit as If _____, then, _____ and (b) write the first sentence of a proof (the “starting point”) and the last sentence of a proof (the “conclusion to be shown”). Note that you do not need to understand the statements in order to be able to do these exercise.
Exercise
For all integers m and n, if mn = 1 then m = n = 1 or m = n = −1.
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