Stanisław Jaśkowski (Polish pronunciation: [staˈɲsvaf jaɕˈkɔfskʲi]; 22 April 1906, in Warsaw – 16 November 1965, in Warsaw) was a Polish logician who made important contributions to proof theory and formal semantics. He was a student of Jan Łukasiewicz and a member of the Lwów–Warsaw School of Logic. He is regarded as one of the founders of natural deduction, which he discovered independently of Gerhard Gentzen in the 1930s. He is also known for his research into paraconsistent logic. He was the President (rector) of the Nicolaus Copernicus University in Toruń.
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Stanisław Jaśkowski (Polish pronunciation: [staˈɲsvaf jaɕˈkɔfskʲi]; 22 April 1906, in Warsaw – 16 November 1965, in Warsaw) was a Polish logician who made important contributions to proof theory and formal semantics. He was a student of Jan Łukasiewicz and a member of the Lwów–Warsaw School of Logic. He is regarded as one of the founders of natural deduction, which he discovered independently of Gerhard Gentzen in the 1930s. He is also known for his research into paraconsistent logic. He was the President (rector) of the Nicolaus Copernicus University in Toruń.
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Life and career He was born in 1906 in Warsaw to father Feliks Jaśkowski and mother Kazimiera (nee Dzierzbicka). In 1924, he graduated from high school in Zakopane and enrolled at the University of Warsaw to study mathematics. He was taught mathematical logic under Jan Łukasiewicz and participated in the Polish Mathematicians' Congresses in Lviv (1927) and Vilnius (1931). After the outbreak of World War II, he participated in the September Campaign as a volunteer. In 1942, he was briefly imprisoned by the Germans. In 1945, he continued his scientific career at the University of Toruń where he defended his habilitation and assumed the post of the head of the Faculty of Mathematical Logic. Since 1950, he collaborated with the State Institute of Mathematics of the Polish Academy of Sciences (PAN). Between 1959–1962, he served as the Rector of the University. He was among the founders and served as the first President of the Polish Mathematical Society's branch in Toruń. Jaśkowski is considered to be one of the founders of natural deduction, which he discovered independently of Gerhard Gentzen in the 1930s. Gentzen's approach initially became more popular with logicians because it could be used to prove the cut-elimination theorem.…
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Works On the Rules of Suppositions in Formal Logic Studia Logica 1, 1934 pp. 5–32 (reprinted in: Storrs McCall (ed.), Polish Logic 1920-1939, Oxford University Press, 1967 pp. 232–258 Investigations into the System of Intuitionist Logic 1936 (translated in: Storrs McCall (ed.), Polish Logic 1920-1939, Oxford University Press, 1967 pp. 259–263 A propositional Calculus for Inconsistent Deductive Systems 1948 (reprinted in: Studia Logica, 24 1969, pp 143–157 and in: Logic and Logical Philosophy 7, 1999 pp. 35–56) On the Discussive Conjunction in the Propositional Calculus for Inconsistent Deductive Systems 1949 (reprinted in: Logic and Logical Philosophy 7, 1999 pp. 57–59) On Formulas in which no Individual Variable occurs more than Twice, Journal of Symbolic Logic, 31, 1966, pp. 1–6) in Polish
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Sources Jerzy Perzanowski (1999). "Fifty Years of Parainconsistent Logics" (PDF). Logic and Logical Philosophy. 7: 21–24. Archived from the original (PDF) on 2006-04-04. Woleński, Jan (2003). "Lvov-Warsaw School". The Stanford Encyclopedia of Philosophy (Summer 2003 Edition). Retrieved 2006-03-11. Jerzy Kotas, August Pieczkowski. Scientific works of Stanisław Jaśkowski, Studia Logica 21, 1967, 7-15
