What is lagrange theorem? - Quora

PDF) Two refinements of Lagrange's four-square theorem

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PDF] New parametrization of $A^2+B^2+C^2=3D^2$ and 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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1.28: Sum of Squares - Mathematics LibreTexts