A STUDY ON FOUR SQUARE THEOREM
Abstract
The four square theorem was proved by Lagrange in 1770; every positive integer is the sum of four squares. i.e, n=A2+B2+C2+D2, where, A,B,C,D ϵ z An interesting proof is presented here based on Hurwitz integers, a subset of Quarternions which act like integers in four dimension and have the prime divisor property