(-a) × (-a) = a × a – codegolf.stackexchange.com

(-a) × (-a) = a × a – codegolf.stackexchange.com

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We all know that (-a) × (-a) = a × a (hopefully), but can you prove it? Your task is to prove this fact using the ring axioms. To avoid ambiguity here are the ring axioms where + and × are closed ...

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