Mojżesz David Kirszbraun (1903–1942)
Mojżesz Kirszbraun
', Holocaust Survivors and Victims Database. was a Polish mathematician, mostly known for the

Kirszbraun theorem In mathematics, specifically real analysis and functional analysis, the Kirszbraun theorem states that if is a subset of some Hilbert space , and is another Hilbert space, and : f: U \rightarrow H_2 is a Lipschitz-continuous map, then there ...

on extensions of Lipschitz maps. This theorem appears in his master's thesis, defended in Warsaw in 1930. Kirszbraun finished school in 1922. Together with his classmate

Adolf Lindenbaum Adolf Lindenbaum (12 June 1904 – August 1941) was a Polish-Jewish logician and mathematician best known for Lindenbaum's lemma and Lindenbaum–Tarski algebras. He was born and brought up in Warsaw. He earned a Ph.D. in 1928 under Wacław ...

, he continued his studies in

Warsaw University The University of Warsaw ( pl, Uniwersytet Warszawski, la, Universitas Varsoviensis) is a public university in Warsaw, Poland. Established in 1816, it is the largest institution of higher learning in the country offering 37 different fields of ...

. Later, he worked as an actuary in an insurance company. He died in a ghetto in 1942.

Publications

References

An entry
about Kirszbraun written by

Edward Marczewski Edward Marczewski (15 November 1907 – 17 October 1976) was a Polish mathematician. He was born Szpilrajn but changed his name while hiding from Nazi persecution. Marczewski was a member of the Warsaw School of Mathematics. His life and work aft ...

Polski słownik biograficzny ''Polski Słownik Biograficzny'' (''PSB''; Polish Biographical Dictionary) is a Polish-language biographical dictionary, comprising an alphabetically arranged compilation of authoritative biographies of some 25,000 notable Poles and of foreigners ...

, Tom XII, p. 486 20th-century Polish mathematicians Polish Jews who died in the Holocaust 1942 deaths Year of birth uncertain 1903 births {{poland-bio-stub