Real Analysis Proof: Prove mn=1 => m=1 & n=1 or m=-1 & n=-1

Thread starter johnjuwax
Start date Dec 11, 2009
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Analysis Proof Real analysis

Dec 11, 2009

johnjuwax

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.

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Dec 11, 2009

Petek

Gold Member

What have you already tried and where are you stuck?

Petek

Dec 11, 2009

VeeEight

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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