What Columbia University professor proved the Earle-Hamilton fixed-point theorem with Clifford Earle in 1968?
Richard S. Hamilton Richard Streit Hamilton (born 1943) is Davies Professor of Mathematics at Columbia University.
Nick Katz Nicholas Michael "Nick" Katz (born December 7, 1943) is an American mathematician, working in the fields of algebraic geometry, particularly on "p"-adic methods, monodromy and moduli problems, and number theory. He is currently a professor in the Mathematics Department at Princeton University in Princeton, New Jersey and an editor of the journal "Annals of Mathematics".