Lagrange's four-square theorem

PDF) Extended 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

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Knowledge Zone Lagrange's four-square theorem

PDF) Two refinements of Lagrange's four-square theorem

Answered: The Modular Operation r mod m = r…

Euler's four-square identity - Wikipedia

code golf - Four Squares Together - Code Golf Stack Exchange

The Method of Lagrange Multipliers, by Panda the Red

PDF] New parametrization of $A^2+B^2+C^2=3D^2$ and Lagrange's four-square theorem