Table of Contents
Links

[5. Biographical Notes.]
Hans Hahn.
The mathematician and philosopher Hans Hahn
(Vienna 1879  Vienna 1934) was the coauthor of
the manifesto of the Vienna Circle. He received his
degree in mathematics in 1902; afterwards he
studied under the direction of Boltzmann in Vienna
and Hilbert, Klein, Minkowski in Gottingen. In 1905
he taught mathematics at Innsbruck and in 1909 at
the University of Vienna. In 1907 Hahn, Frank, and
Neurath began their meetings on philosophy. After
the First World War, during which he taught in
Bonn, Hahn returned to the University of Vienna
(1921). In 1922 Hanh, with the help of Frank,
arranged to bring Schlick to the University of
Vienna.
Hahn held courses on the symbolic logic, the
foundations of mathematics, and Wittgenstein's
Tractatus. One of his students was K. R.
Popper, who found Hahn’s lectures very
interesting and of perfect clarity. Another student
of Hahn’s was Kurt Gödel, who wrote his
dissertation, in which he proved the completeness
of first order logic, under Hahn's direction. Hahn
was an editor of the series
Einheitswissenschaft.
