What Is A 1 In A Million Thing That Has Happened To You That Sounds Like A Complete Lie, But You Actually Have Proof Of?

Jun 13, 2020is there a formal proof for $(-1) \\times (-1) = 1$? It's a fundamental formula not only in arithmetic but also in the whole of math. Is there a proof for it or is it just assumed?

Aug 24, 2016false proof of 1=-1 [duplicate] ask question asked 9 years, 5 months ago modified 9 years, 5 months ago Aug 30, 2010there are infinitely many possible values for $1^i$, corresponding to different branches of the complex logarithm.