PDF) Quarternions and the Four Square Theorem

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

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PDF] Abelian subgroup structure of square complex groups and arithmetic of quaternions

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PDF) Quarternions and the Four Square Theorem

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