Sum of four Squares

MathType on X: Lagrange's four-square theorem asserts that any positive whole number can be written as the sum of four squares of integers. Leave an example in the comments! #MathType #NumberTheory #math #

PDF) Two refinements of Lagrange's four-square theorem

Euler's four-square identity

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

Lagrange's four-square theorem - Wikiwand

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

Pythagorean Theorem

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

Euler Four-Square Identity -- from Wolfram MathWorld

SOLUTION: Legendre's two, three and four square theorem (number theory) - Studypool