Jun 13, 2020ย ยท Is 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? Jan 15, 2013ย ยท Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$. Can you think. Mar 30, 2020ย ยท A -1 A means that first we apply A transformation then we apply A -1 transformation. When we apply A transformation we reach some plane having some different basis vectors but after.

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