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Jan LukasiewiczJan Łukasiewicz (born 21 December, 1878 - 13 February, 1956) was a mathematician born in Lww, Galicia (now L'viv, Ukraine). His major mathematical work centred on mathematical logic. He thought innovatively about traditional propositional logic, the principle of non-contradiction and the law of excluded middle. Łukasiewicz worked on multi-valued logics, including his own three-valued propositional calculus, the first non-classical logical calculus. He is responsible for one of the most elegant axiomatizations of classical propositional logic; it has just three axioms and is one of the most used axiomatizations today. He also pursued philosophy, approaching the human aspects of scientific theory-making with ideas similar to those of Karl Popper. Łukasiewicz's Polish notation of 1920 was at the root of the idea of the recursive stack a last-in, first-out computer memory store invented by Charles Hamblin of the New South Wales University of Technology (NSWUT), and first implemented in 1957. This design led to the English Electric multi-programmed KDF9 computer system of 1963, which had two such hardware register stacks. A similar concept underlies the reverse Polish notation (or postfix notation) of Hewlett Packard calculators, or the PostScript page description language. Life events External links Reading - Aristotle & Łukasiewicz on the Principle of Contradiction, ed. by Frederick Seddon (Modern Logic, 1996) ASIN 1884905048
- Philosophical Logic in Poland, ed. by Jan Wolenski (Kluwer, 1994) ISBN 0792322932
- Jan Łukasiewicz: Elements of Mathematical Logic, Warsaw, Państwowe Wydawnictwo Naukowe, 1963
- Jan Łukasiewicz: Selected Works, Amsterdam, North-Holland, 1970
Lukasiewicz, JanLukasiewicz, JanLukasiewicz, JanLukasiewicz, Jan
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