Zygmunt Zalcwasser (1898 – 1943) was a Polish mathematician from the

Warsaw School of Mathematics Warsaw School of Mathematics is the name given to a group of mathematicians who worked at Warsaw, Poland, in the two decades between the World Wars, especially in the fields of logic, set theory, point-set topology and real analysis. They pu ...

in the period

between the World Wars In the history of the 20th century, the interwar period lasted from 11 November 1918 to 1 September 1939 (20 years, 9 months, 21 days), the end of the First World War to the beginning of the Second World War. The interwar period was relativel ...

collaborating especially in the fields of

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premise ...

set theory Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory, as a branch of mathematics, is mostly conce ...

general topology In mathematics, general topology is the branch of topology that deals with the basic set-theoretic definitions and constructions used in topology. It is the foundation of most other branches of topology, including differential topology, geometri ...

and

real analysis In mathematics, the branch of real analysis studies the behavior of real numbers, sequences and series of real numbers, and real functions. Some particular properties of real-valued sequences and functions that real analysis studies include conv ...

. Zalcwasser, who worked on the Fourier series, introduced the Zalcwasser rank ameasuring the uniform convergence of sequences of

continuous functions In mathematics, a continuous function is a function such that a continuous variation (that is a change without jump) of the argument induces a continuous variation of the value of the function. This means that there are no abrupt changes in valu ...

on the

unit interval In mathematics, the unit interval is the closed interval , that is, the set of all real numbers that are greater than or equal to 0 and less than or equal to 1. It is often denoted ' (capital letter ). In addition to its role in real analysis ...

.Haseo Ki, A.M.S. (November 1995)
Zalcwasser rank compared with Kechris-Woodin rank
Transactions of the American Mathematical Society, Volume 347, Number 11. Zalcwasser received his

Ph.D. A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin: or ') is the most common degree at the highest academic level awarded following a course of study. PhDs are awarded for programs across the whole breadth of academic fields. Because it is ...

at the

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 ...

in 1928. He served as professor at the ''

Wolna Wszechnica Polska Free Polish University ( pl, Wolna Wszechnica Polska), founded in 1918 in Warsaw, was a private high school with different departments: mathematics and natural sciences, humanities, political sciences and social pedagogy. From 1929, its degrees ...

'' in 1933–34 and after the

invasion of Poland The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany and the Soviet Union which marked the beginning of World War II. The German invasion began on 1 September 1939, one week aft ...

in 1939 lived in the

Warsaw Ghetto The Warsaw Ghetto (german: Warschauer Ghetto, officially , "Jewish Residential District in Warsaw"; pl, getto warszawskie) was the largest of the Nazi ghettos during World War II and the Holocaust. It was established in November 1940 by the G ...

. He was murdered in the gas chambers of the

Treblinka extermination camp Treblinka () was an extermination camp, built and operated by Nazi Germany in occupied Poland during World War II. It was in a forest north-east of Warsaw, south of the village of Treblinka in what is now the Masovian Voivodeship. The camp ...

in 1943 during

the Holocaust in Poland The Holocaust in Poland was part of the European-wide Holocaust organized by Nazi Germany and took place in German-occupied Poland. During the genocide, three million Polish Jews were murdered, half of all Jews murdered during the Holocaust. ...

.Małgorzata Przeniosło
Powstanie i rozwój warszawskiej szkoły matematycznej w dwudziestoleciu międzywojennym (Development of the Warsaw School of Mathematics)
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References

* * 20th-century Polish mathematicians 1898 births 1943 deaths Polish people who died in Treblinka extermination camp Polish Jews who died in the Holocaust {{Poland-mathematician-stub