Hans Hahn (mathematician)

Hans Hahn
Hans Hahn
	Hans Hahn (about 1905)
Born	27 September 1879; Vienna, Austria-Hungary
Died	24 July 1934 (aged 54); Vienna, Austria
Education	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 (/hɑːn/; 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.