PDF) A Simple Proof of Jacobi's Four-Square Theorem

Chit-chat on Lagrange's four-square theorem

Seatings and Sums of Squares

PDF) Lagrange's Four-Square Theorem

Solved In Number Theory, Lagrange's four-square theorem

Lagrange's Four Square Theorem

CodeChef - Lagrange's four-square theorem, also known as Bachet's conjecture, states that every natural number can be represented as the sum of four integer squares. This theorem was proven by Joseph Louis

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Lagrange and the four-square theorem - Archive ouverte HAL

1.28: Sum of Squares - Mathematics LibreTexts

An Independent Quaternion Proof of Jacobi's Four Square Theorem: Zhang, Yuxuan: 9781719171571: : Books