Zygmunt Janiszewski
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Zygmunt Janiszewski (b. June 12, 1888 in Warsaw – January 3, 1920 in Lwów, Poland) was a Polish mathematician.
Janiszewski taught at the University of Lwów and was professor at the University of Warsaw. At the outbreak of World War I he was a soldier of the Polish Legions of Józef Piłsudski.
In 1920, Janiszewski together with Wacław Sierpiński and Stefan Mazurkiewicz, founded the important mathematics journal Fundamenta Mathematica.
The inherited family property left by his father, Zygmunt spent for charity and education. His main interest was topology.
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