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

Sums of four squares — AnhThu Nguyen

PDF) A Simple Proof of Jacobi's Four-Square Theorem

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

SOLUTION: Lagrange s four square theorem - Studypool

PDF] New parametrization of $A^2+B^2+C^2=3D^2$ and Lagrange's four-square theorem

PDF) Quarternions and the Four Square Theorem

Four Square Theorem - Quaternions, PDF, Prime Number

number theory - The Four Square Theorem and Integral Apollonian Circle Packings, is there any connection? - Mathematics Stack Exchange

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

Lagrange and the four-square theorem - Archive ouverte HAL