(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.

**Physics Forums - The Fusion of Science and Community**

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

Have something to add?

- Similar discussions for: -1*-1=1 ? how to prove

Loading...

**Physics Forums - The Fusion of Science and Community**