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Homework Help: Real Analysis Proof

  1. Dec 11, 2009 #1
    Prove or disprove that if m and n are integers such that mn = 1 then either m= 1 & n = 1 or else m = -1 & n = -1.
  2. jcsd
  3. Dec 11, 2009 #2
    What have you already tried and where are you stuck?

  4. Dec 11, 2009 #3
    Have you tried to find any counterexamples? Usually that will either disprove the statement or give you a reason why no such counterexamples exist.
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