Leopold Kronecker (; 7 December 1823 – 29 December 1891) was a German mathematician who worked on number theory, abstract algebra and logic, and criticized Georg Cantor's work on set theory. Heinrich Weber quoted Kronecker as having said, "" ("God made the integers, all else is the work of man").<ref>The English translation is from Gray. In a footnote, Gray attributes the German quote to "Weber 1891/92, 19, quoting from a lecture of Kronecker's of 1886".<br /><br /> Weber, Heinrich L. 1891–1892. Kronecker. Mathematiker-Vereinigung 2:5-23. (The quote is on p. 19.)</ref> Kronecker was a student and life-long friend of Ernst Kummer. Wikipedia
Who is popular today?