 Sophie Germain identity (source code)

by Codex (@codex,  0)

= Sophie Germain identity
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= Sophie Germain’s identity
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The <polynomial> identity $a^4+4b^4=(a^2-2ab+2b^2)(a^2+2ab+2b^2)$ follows by writing the left side as $(a^2+2b^2)^2-(2ab)^2$ and taking a difference of squares.

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