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250px (Chaim) Herman Müntz (28 August 1884, in
Łódź Łódź is a city in central Poland and a former industrial centre. It is the capital of Łódź Voivodeship, and is located south-west of Warsaw. Łódź has a population of 655,279, making it the country's List of cities and towns in Polan ...
– 17 April 1956, in
Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...
) was a German
mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...
, now remembered for the Müntz approximation theorem.


Biography

He was born in
Łódź Łódź is a city in central Poland and a former industrial centre. It is the capital of Łódź Voivodeship, and is located south-west of Warsaw. Łódź has a population of 655,279, making it the country's List of cities and towns in Polan ...
(then in the Piotrków Governorate of the
Russian Empire The Russian Empire was an empire that spanned most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about , roughl ...
, now in
Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...
) in a secular
Jew Jews (, , ), or the Jewish people, are an ethnoreligious group and nation, originating from the Israelites of ancient Israel and Judah. They also traditionally adhere to Judaism. Jewish ethnicity, religion, and community are highly inte ...
ish 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 equation In mathematics, a partial differential equation (PDE) is an equation which involves a multivariable function and one or more of its partial derivatives. The function is often thought of as an "unknown" that solves the equation, similar to ho ...
s and the
Plateau problem In mathematics, Plateau's problem is to show the existence of a minimal surface with a given boundary, a problem raised by Joseph-Louis Lagrange in 1760. However, it is named after Joseph Plateau who experimented with soap films. The problem is ...
, in 1910, supervised by H. A. Schwarz. In 1911 he moved to
Munich Munich is the capital and most populous city of Bavaria, Germany. As of 30 November 2024, its population was 1,604,384, making it the third-largest city in Germany after Berlin and Hamburg. Munich is the largest city in Germany that is no ...
. In the following years he published on
projective geometry In mathematics, projective geometry is the study of geometric properties that are invariant with respect to projective transformations. This means that, compared to elementary Euclidean geometry, projective geometry has a different setting (''p ...
,
iterative method In computational mathematics, an iterative method is a Algorithm, mathematical procedure that uses an initial value to generate a sequence of improving approximate solutions for a class of problems, in which the ''i''-th approximation (called an " ...
s, and
approximation theory In mathematics, approximation theory is concerned with how function (mathematics), functions can best be approximation, approximated with simpler functions, and with quantitative property, quantitatively characterization (mathematics), characteri ...
. In 1914 he took a teaching position in a school near
Heppenheim Heppenheim (Bergstraße) () is the seat of Bergstraße district in Hesse, Germany, lying on the Bergstraße on the edge of the Odenwald. It is best known for being the birthplace of Sebastian Vettel, a four-time Formula One World Champion and ...
, 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 Göttingen (, ; ; ) is a college town, university city in Lower Saxony, central Germany, the Capital (political), capital of Göttingen (district), the eponymous district. The River Leine runs through it. According to the 2022 German census, t ...
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 Habilitation is the highest university degree, or the procedure by which it is achieved, in Germany, France, Italy, Poland and some other European and non-English-speaking countries. The candidate fulfills a university's set criteria of excellen ...
. In 1927 he worked closely with
Albert Einstein Albert Einstein (14 March 187918 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence f ...
. In 1929 he took a professorial position at the
Leningrad State University Saint Petersburg State University (SPBGU; ) is a public research university in Saint Petersburg, Russia, and one of the oldest and most prestigious universities in Russia. Founded in 1724 by a decree of Peter the Great, the university from the be ...
, where he was active in teaching, research, administration and as an editor of Lyapunov. Though he left Germany before the Nazis seized power in 1933, some scholars consider him an early Jewish emigrant from Nazi Germany; his career was negatively impacted by anti-semitism and he was not able to return to Germany, unlike early non-Jewish emigrants such as
Eberhard Hopf Eberhard Frederich Ferdinand Hopf (April 4, 1902 in Salzburg, Austria-Hungary – July 24, 1983 in Bloomington, Indiana, USA) was a German mathematician and astronomer, one of the founding fathers of ergodic theory and a pioneer of bifurcation the ...
and Wilhelm Maier. In 1932 he was an official Soviet delegate to the
International Congress of Mathematicians The International Congress of Mathematicians (ICM) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU). The Fields Medals, the IMU Abacus Medal (known before ...
, with N. G. Chebotarev, P. S. Alexandrov, and E. Y. Kolman, an ideological Marxist. While in Russia, Müntz was influential in helping several other mathematicians escape from the Nazis.. Siegmund-Schultze quotes from 1 1937 letter by Müntz: "The appointments of Cohn-Vossen, Walfisz, Pollaczek (the latter was not allowed to slip in again) were immediately influenced by myself, the ones for Plessner and Bergmann indirectly." 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 Judaism () is an Abrahamic religions, Abrahamic, Monotheism, monotheistic, ethnic religion that comprises the collective spiritual, cultural, and legal traditions of the Jews, Jewish people. Religious Jews regard Judaism as their means of o ...
and related topics. In 1907 his book ''Wir Juden'' was published in Berlin. He was a correspondent of
Martin Buber Martin Buber (; , ; ; 8 February 1878 – 13 June 1965) was an Austrian-Israeli philosopher best known for his philosophy of dialogue, a form of existentialism centered on the distinction between the I and Thou, I–Thou relationship and the I� ...
, and wrote much for Buber's journal ''Der Jude''.


Selected publications

*Müntz, Ch. H., ''Über den Approximationssatz von Weierstrass'', (1914) in H. A. Schwarz's Festschrift, pp. 303–312. *Müntz, Ch. H., "Zum Randwertproblem der partiellen Differentialgleichung der minimal Flächen (PhD thesis, Berlin 1910) http://gdz.sub.uni-goettingen.de/dms/load/img/?PID=PPN271032634, LOG_0002


References

{{DEFAULTSORT:Muntz, Herman 1884 births 1956 deaths 20th-century German mathematicians Jewish emigrants from Nazi Germany to Sweden Soviet mathematicians 20th-century Swedish mathematicians Scientists from Łódź Humboldt University of Berlin alumni Jewish German scientists