Chit-chat on Lagrange's four-square theorem

Lagrange’s four-square theorem is a beautiful result in number theory. However, to the best of my knowledge, I haven’t encountered it often in theoretical computer science. Today’s entry discusses two interesting stories related to this theorem.

PDF) Basic Analysis laura gtz

Lagrange's four-square theorem - Wikipedia

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Lagrange's Four-Square Theorem -- from Wolfram MathWorld

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Lagrange's four-square theorem

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