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

Table 1 from Extended Lagrange's four-square theorem

Solved Theorem 8.35 (Lagrange's Four-Square Theorem) If n is

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

Lagrange's four-square theorem, polynomials, diophantine equations, prime numbers

Solved QUADRA range's Four-Square Theorem) If n is a natural

SOLVED: 8.35 (Lagrange's Four-Square Theorem) If n is a natural number, it can be expressed as the sum of four squares. A lattice in 4-space is a set of the form (x,y,z,w)

2023 Number Challenge: Find sum of four squares that is equal to 2023

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

Lagrange and the four-square theorem - Archive ouverte HAL

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