Leopold Kronecker

Leopold Kronecker (; 7 December 1823 – 29 December 1891) was a German mathematician who worked on number theory, algebra and logic. He criticized Georg Cantor's work on set theory, and was quoted by as having said, "''''" ("God made the integers, all else is the work of man"). Kronecker was a student and life-long friend of Ernst Kummer. Provided by Wikipedia