Euler Four-Square Identity -- from Wolfram MathWorld

The amazing polynomial identity communicated by Euler in a letter to Goldbach on April 12, 1749 (incorrectly given as April 15, 1705--before Euler was born--in Conway and Guy 1996, p. 232). The identity also follows from the fact that the norm of the product of two quaternions is the product of the norms (Conway and Guy 1996).

The Most Striking Equation in Mathematics – Galileo's Pendulum

Decomposing Fourier transforms — an introduction to time-frequency

PDF) Dedekind's arithmetic function and primitive four squares

Polynomial Identity -- from Wolfram MathWorld

Symmetrical distributions of aminoacyl-tRNA synthetases during the

Open problem in number theory

Processing benfry part 2 by Byron Sin - Issuu

Design – Page 2 – Math ∩ Programming

Intensity Constraint Gradient-Based Image Reconstruction