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Congruences and modular arithmetic

label Algebra
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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.

Apr 4th, 2015

hey, I don't see any pictures here? I would be happy to help you, thanks.

Apr 4th, 2015

ss (2015-04-04 at 12.57.00).png 

Here's the picture

Apr 4th, 2015

ss (2015-04-04 at 12.57.00).png 

Here's the picture

Apr 4th, 2015

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Apr 4th, 2015
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Apr 4th, 2015
Aug 19th, 2017
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