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In mathematics, Łukasiewicz logic (; (:wukaˈɕɛvʲitʂ)) is a non-classical, many valued logic. It was originally defined in the early 20th-century by Jan Łukasiewicz as a three-valued logic;〔Łukasiewicz J., 1920, O logice trójwartościowej (in Polish). Ruch filozoficzny 5:170–171. English translation: On three-valued logic, in L. Borkowski (ed.), ''Selected works by Jan Łukasiewicz'', North–Holland, Amsterdam, 1970, pp. 87–88. ISBN 0-7204-2252-3〕 it was later generalized to ''n''-valued (for all finite ''n'') as well as infinitely-many-valued (ℵ0-valued) variants, both propositional and first-order.〔Hay, L.S., 1963, Axiomatization of the infinite-valued predicate calculus. ''Journal of Symbolic Logic'' 28:77–86.〕 The ℵ0-valued version was published in 1930 by Łukasiewicz and Alfred Tarski; consequently it is sometimes called the Łukasiewicz-Tarski logic.〔 citing Łukasiewicz, J., Tarski, A.: (Untersuchungen über den Aussagenkalkül ). Comp. Rend. Soc. Sci. et Lettres Varsovie Cl. III 23, 30–50 (1930).〕 It belongs to the classes of t-norm fuzzy logics〔Hájek P., 1998, ''Metamathematics of Fuzzy Logic''. Dordrecht: Kluwer.〕 and substructural logics.〔Ono, H., 2003, "Substructural logics and residuated lattices — an introduction". In F.V. Hendricks, J. Malinowski (eds.): Trends in Logic: 50 Years of Studia Logica, ''Trends in Logic'' 20: 177–212.〕 This article presents the Łukasiewicz() logic in its full generality, i.e. as an infinite-valued logic. For an elementary introduction to the three-valued instantiation Ł3, see three-valued logic. == Language == The propositional connectives of Łukasiewicz logic are ''implication'' , ''negation'' , ''equivalence'' , ''weak conjunction'' , ''strong conjunction'' , ''weak disjunction'' , ''strong disjunction'' , and propositional constants and . The presence of conjunction and disjunction is a common feature of substructural logics without the rule of contraction, to which Łukasiewicz logic belongs. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Łukasiewicz logic」の詳細全文を読む スポンサード リンク
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