Hans Hahn (mathematician)

Hans Hahn
Hans Hahn (about 1905)
Born	(1879-09-27)27 September 1879 Vienna, Austria-Hungary
Died	24 July 1934(1934-07-24) (aged 54) Vienna, Austria
Nationality	Austrian
Alma mater	University of Vienna (PhD, 1902)
Known for	Hahn series Hahn decomposition theorem Hahn embedding theorem Hahn–Banach theorem Hahn–Kolmogorov theorem Hahn–Mazurkiewicz theorem Vitali–Hahn–Saks theorem Canonical map Uniform boundedness principle
Awards	Lieben Prize (1921)
Scientific career
Fields	Mathematician Philosopher
Institutions	University of Vienna Chernivtsi University University of Bonn
Thesis	Zur Theorie der zweiten Variation einfacher Integrale  (1902)
Doctoral advisor	Gustav Ritter von Escherich
Doctoral students	Karl Menger Witold Hurewicz Felix Frankl Kurt Gödel
Other notable students	Karl Popper

Hans Hahn (German: [haːn]; 27 September 1879 – 24 July 1934) was an Austrian mathematician and philosopher who made contributions to functional analysis, topology, set theory, the calculus of variations, real analysis, and order theory. In philosophy he was among the main logical positivists of the Vienna Circle.