This handout accompanied my talk in the Spring 2007 seminar on Fermat's Last Theorem held by Michael Joyce at Tulane University. read more »
Consider the ring of integers modulo some number n. Does there exist a square root of -1 in ? Equivalently, does there exist an integer x such that n divides x2 + 1? read more »
Date: Mon, 5 Jul 2010
of integers modulo some number n. Does there exist a square root of -1 in 
