I'm looking over the solution for one of my assignment questions, which is the picture you see here.
A part of a solution says "Supose [a] = [a]^-1. This implies that a^2 is congruent to 1 mod p." I do not get how it transitioned between the steps.
hey, I don't see any pictures here? I would be happy to help you, thanks.
ss (2015-04-04 at 12.57.00).png
Here's the picture
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