PDF) Quarternions and the Four Square Theorem
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Descrição
The Four Square Theorem was proved by Lagrange in 1770: ev- ery positive integer is the sum of at most four squares of positive integers, i.e. n = A2 +B2 +C2 +D2;A;B;C;D 2 Z An interesting proof is presented here based on Hurwitz integers, a subset
Page:Scientific Papers of Josiah Willard Gibbs - Volume 2.djvu/130 - Wikisource, the free online library
PDF] New parametrization of $A^2+B^2+C^2=3D^2$ and Lagrange's four-square theorem
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