Jan Łukasiewicz

Jan Leopold Łukasiewicz was a Polish logician and philosopher best known for Polish notation and Łukasiewicz logic. His work centred on philosophical logic, mathematical logic and the history of logic, and he offered one of the earliest systems of many-valued logic. Born in Lemberg, Austria-Hungary, now Lviv in Ukraine, on 21 December 1878, he studied philosophy and mathematics at Lemberg University as a pupil of Kazimierz Twardowski and received his doctorate in 1902. He became a lecturer at Lemberg in 1906, a full professor at the University of Warsaw in 1915, and remained a professor there from 1920 until 1939, when the university was closed by the German occupation. In 1946 he and his wife moved to Dublin, where he remained until his death in 1956.