Number Theory Sums of Squares Part 7.

Jacobi's four-square theorem

What's so interesting about squared numbers? Lagrange's Four Square Theorem

5. * In the following sequence of problems, we will

Lagrange's Four-Square Theorem Seen Using Polygons and Lines

Discrete quantum computation 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

PPT - Waring's Problem PowerPoint Presentation, free download - ID:4504701

Lagrange and the four-square theorem - Archive ouverte HAL

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

Euler Four-Square Identity -- from Wolfram MathWorld