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

Table 3 from Extended Lagrange's four-square theorem

Jacobi's four-square theorem - Wikipedia

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

m 8.35 (Lagrange's Four-Square Theorem) If n is a

SOLVED: Theorem 8.35 (Lagrange's Four-Square Theorem) then n can be expressed as the sum If n is a number; of four squares: natural lattice A in 4-space is a set of the

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

Sum of two squares theorem - Wikipedia

Lagrange and the four-square theorem - Archive ouverte HAL

Proving the Pythagorean Theorem. Some algebraic and geometric proofs of…, by Michele Diodati, Not Zero