Paul Althaus Smith (May 18, 1900 – June 13, 1980) was an American mathematician.
His name occurs in two significant conjectures in geometric topology: the Smith conjecture, which is now a theorem, and the Hilbert–Smith conjecture, which was proved in dimension 3 in 2013.
Smith theory is a theory about homeomorphisms of finite order of manifolds, particularly spheres.
Smith was a student of Solomon Lefschetz at the University of Kansas, moving to Princeton University with Lefschetz in the mid-1920s.
He finished his doctorate at Princeton, in 1926.
His Ph.D.
thesis was published in the Annals of Mathematics that same year.