Euler's four-square identity - Wikipedia

Table 1 from Extended Lagrange's four-square theorem

数论代考, 四平方和定理The four square theorem 代写

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

Sums of four squares — AnhThu Nguyen

Jacobi's four-square theorem

SOLVED: In the following sequence of problems, we will start the proof of the Four-Square Theorem conjectured in the third century by Diophantus and proven by Lagrange in 1770 (since it took

Answered: The Modular Operation r mod m = r…

An Independent Quaternion Proof of Jacobi's Four Square Theorem: Zhang, Yuxuan: 9781719171571: : Books

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

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