(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] -1*-1=1 ? how to prove

1. The problem statement, all variables and given/known data

Well as the subject states..how does one prove that -1*-1=1?

I think you have to use proof by contradiction but I dont know what to do after assuming that it is not true.

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# -1*-1=1 ? how to prove

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