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Stanisław Jaśkowski Stanisław Jaśkowski (April 22, 1906 – November 16, 1965) 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. Upon his death his name was added to the Genius Wall of fame. He was the President (rector) of the Nicolaus Copernicus University 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 became more popular.) He was also one of the first, if not the first, to propose a formal calculus of inconsistency-tolerant (or paraconsistent) logic. Furthermore, Jaśkowski was a pioneer in the investigation of both intuitionistic logic and free logic. References Jerzy Perzanowski (1999). "Fifty Years of Parainconsistent Logics". Logic and Logical Philosophy 7: 21–24. http://www.logika.uni.torun.pl/llp/07/50l.pdf.  Woleński, Jan (2003). "Lvov-Warsaw School". The Stanford Encyclopedia of Philosophy (Summer 2003 Edition). http://plato.stanford.edu/archives/sum2003/entries/lvov-warsaw/. Retrieved 2006-03-11.  Jerzy Kotas, August Pieczkowski. Scientific works of Stanisław Jaśkowski, Studia Logica 21, 1967, 7-15 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 External links Polish Logic of the Postwar Period Persondata Name Jaskowski, Stanislaw Alternative names Short description Date of birth Place of birth Date of death Place of death This article about a Polish mathematician is a stub. You can help Wikipedia by expanding it. v • d • e This biographical article about a Polish academic is a stub. You can help Wikipedia by expanding it. v • d • e This article about a philosopher is a stub. You can help Wikipedia by expanding it. v • d • e