Lagrange's four-square theorem

Sum of four Squares

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

5. * In the following sequence of problems, we will

PDF) Extended Lagrange's four-square theorem

Lagrange's Four-Square Theorem -- from Wolfram MathWorld

Pythagorean Theorem

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

Chapter 3 Greek Number Theory The Role of Number Theory Polygonal, Prime and Perfect Numbers The Euclidean Algorithm Pell's Equation The Chord and Tangent. - ppt download

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