Zygmunt Janiszewski
Zygmunt Janiszewski (Warsaw, June 12, 1888 - Lwów, January 3, 1920) was a Polish mathematician from the Warsaw Mathematics School.
Janiszewski studied in Zurich, Munich, Göttingen and Paris from 1907. In 1911 he graduated from the Sorbonne at Henri Lebesgue. Before the First World War, he taught at the Société des Cours des Sciences in Warsaw (an illegal university under Russian rule) from 1911. From 1913 he did the same in Lwów. During the First World War he fought on the Austrian side as a soldier in the Józef Pilsudski legion and was then active in the underground. Under the name of Zygmunt Wicherkiewicz he was, inter alia, the director of an orphanage. After the war he became professor at the University of Warsaw in 1918. He spent his family capacity for charitable purposes and stimulation of education. Together with Wacław Sierpiński and Stefan Mazurkiewicz he was the founder of mathematical magazine Fundamenta Mathematicae. Janiszewski died at the age of 31 of the effects of the Spanish flu.
As a mathematician he focused on a collective learning-theoretical foundation of topology. He was one of the founders of this direction in Poland, which came to bloom after his death in the 1920s.
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