Euler's four-square identity - Wikipedia

Amazing visual explanation of Euler's Identity. Gauss said that if this identity was not immediately obvious, a person would never be a first class mathematician. I disagree, but this explanation makes it

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Square number - Wikipedia

Share The π: Honoring Neglected Mathematical Constants, by Guido Vivaldi

What is behind the most beautiful equation? Euler's identity

Lagrange's four-square theorem - Wikipedia

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Number Triangles (Triangular Arrays of Numbers): Pascal's Triangle, Others, and the Birth of a New One

Lagrange's four-square theorem - Wikipedia

Euler's Four-square Identity

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