Euler's four-square identity - Wikipedia

LAGRANGE'S FOUR SQUARE THEOREM Theorems, Lagrange theorem, Number theory

Seatings and Sums of Squares

Solved {(x,y,z,w).M: x,y,z, w € Z} Theorem 8.35 (Lagrange's

Euler's four-square identity

PDF) Extended Lagrange's four-square theorem

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

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

GitHub - HechenHu/Four-Square_Representation: Using Rabin and Shallit's Algorithm to compute the four-square representation of a natural number as stated in Lagrange's Four-square Theorem.

PDF) Quarternions and the Four Square Theorem

Sum of two squares theorem - Wikipedia