Euler's four-square identity - Wikipedia

Lagrange's four-square theorem - Wikipedia

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RISIBUES 221 orem 8.35 (Lagrange's Four-Square

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MathType - Lagrange's four-square theorem states that every natural number can be represented as the sum of four integer squares. Proved by Joseph Louis #Lagrange in 1770, it can be regarded as

An Independent Quaternion Proof of Jacobi's Four Square Theorem