Sum of two squares theorem - Wikipedia

Table 1 from Extended Lagrange's four-square theorem

What is lagrange theorem? - Quora

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

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

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

Number Theory Sums of Squares Part 7.

Waring's Problem & Lagrange's Four-Square Theorem

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)

Answered: The Modular Operation r mod m = r…