- Born
- ( 1879-09-27 ) 27 September 1879, Vienna , Austria-Hungary
- Died
- 24 July 1934 (1934-07-24) (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)
- 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