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**(Chaim) Herman Müntz** (1884-1956) was a German mathematician, now
remembered for the Müntz
approximation theorem.

He was born in Łódź (then in the Piotrków Governorate of the Russian Empire,
now in Poland) in a secular Jewish family, who had adopted a German
spelling of the surname Minc. He was educated there and at the Friedrich-Wilhelms-Universität in Berlin,
graduating in 1906. He wrote a doctoral dissertation there on partial differential
equations and the Plateau problem, in
1910, supervised by H. A. Schwarz.

In 1911 he moved to Munich.
In the following years he published on projective
geometry, iterative methods, and approximation theory.

In 1914 he took a teaching position in a school near Heppenheim, and a year
later another in Hochwaldhausen. He became a German citizen in
1919. At around that time he suffered a breakdown, and moved back
to Poland with his wife. He shortly began publishing mathematics
again. The couple moved to Göttingen in 1921, and Müntz became involved
in editorial, reviewing and translation work, as well as research.
At this period, and from 1924 in Berlin, he was unsuccessfully
trying to get an academic position, hampered because he had not habilitated. In 1927 he worked closely with
Albert
Einstein.

In 1929 he took a professorial position at the Leningrad
State University, where he was active in teaching, research,
administration and as an editor of Lyapunov. In 1932 he was an official Soviet
delegate to the International
Congress of Mathematicians., with N. G. Chebotarev,
P. S. Alexandrov, and E. Y. Kolman, an
ideological Marxist. In 1937 Müntz, who remained a German citizen,
was expelled from the USSR. He went to Sweden, where he supported himself by teaching.
He obtained Swedish citizenship in 1953.

He wrote extensively on Judaism and related topics. In 1907 a book
*Wir Juden* was published in Berlin. He was a correspondent
of Martin Buber,
and wrote much for Buber's journal *Der Jude*.

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