Sum of two squares theorem - Wikipedia

Seatings and Sums of Squares

Table 3 from Extended Lagrange's four-square theorem

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

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

PDF) Extended Lagrange's four-square theorem

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.

Pythagorean Theorem

Why was this visual proof missed for 400 years? (Fermat's two square theorem)

Stable/Patient Sort: Bit-Manipulation-To-Solve-Problems-Easily-And-Efficiently, PDF, Square Root

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