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High Quality Content by WIKIPEDIA articles! Zygmunt Janiszewski (June 12, 1888 in Warsaw - January 3, 1920 in Lwów, Poland) was a Polish mathematician. His mother was Julia Szulc-Chojnicka. His father, Czeslaw Janiszewski, was a graduate of the University of Warsaw and was an important person in finance, being the director of the Société du Crédit Municipal in Warsaw.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 in the Polish Legions of Józef Piłsudski, believing he was fighting for Polish independence. ... Read more