- #1
alexk307
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- 0
Homework Statement
Using the lemma below, prove that if two integers divide each other, then they are equal
Lemma: If the product of two integers is 1, then the integers each equal 1.
Homework Equations
The Attempt at a Solution
Very lost here, I can format the proof but I don't know where to start it. Also, isn't the lemma false? If a*b = 1, then a and b equal 1. What about 3/4 * 4/3 = 1? or 2/3 * 3/2 = 1?