Theorems Rectangle Rhombus Square (examples, solutions, worksheets, videos, games, activities)

Lagrange's four-square theorem - Wikipedia

Sums of four squares — AnhThu Nguyen

Lagrange's Four-Square Theorem, PDF, Number Theory

Table 3 from Extended Lagrange's four-square theorem

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

CodeChef - Lagrange's four-square theorem, also known as Bachet's conjecture, states that every natural number can be represented as the sum of four integer squares. This theorem was proven by Joseph Louis

Sum of two squares theorem - Wikipedia

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

Sum of Squares Function -- from Wolfram MathWorld

Euler Four-Square Identity -- from Wolfram MathWorld