MathType - Lagrange's four-square theorem states that every

Jacobi's four-square theorem

Lagrange's four-square theorem - Wikiwand

Lagrange's four-square theorem, polynomials, diophantine equations, prime numbers

SOLVED: 8.35 (Lagrange's Four-Square Theorem) If n is a natural number, it can be expressed as the sum of four squares. A lattice in 4-space is a set of the form (x,y,z,w)

Waring's Problem & Lagrange's Four-Square Theorem

Lagrange's Four Square Theorem

Solved Lagrange's four square theorem says every natural

Why was this visual proof missed for 400 years? (Fermat's two square theorem)

Sum of squares, Part-2, Sum of four squares

Sum of Squares Function -- from Wolfram MathWorld