On this day 202 years ago, December 7, 1823 (November 6, 1823 lunar calendar), the German mathematician Leopold Kronecker was born. Leopold Kronecker December 7, 1823 Leopold Kronecker's birthday (German mathematician). Leopold Kronecker (December 7, 1823 - December 29, 1891), German mathematician and logician, born in Lignitz (now Legnica, Poland), died in Berlin. He believed that both arithmetic and mathematical analysis must be based on integers, and he once said: "God created integers, and the rest is the work of man" (Bell 1986, p. 477). This contradicts the views of the mathematician Georg Cantor, a student and lifelong friend of Ernst Kummer.