Algebraic Foundations of Many-Valued Reasoning
Springer Netherlands, Nov 30, 1999 - Philosophy - 233 pages
The aim of this book is to give self-contained proofs of all basic results concerning the infinite-valued proposition al calculus of Lukasiewicz and its algebras, Chang's MV -algebras. This book is for self-study: with the possible exception of Chapter 9 on advanced topics, the only prere quisite for the reader is some acquaintance with classical propositional logic, and elementary algebra and topology. In this book it is not our aim to give an account of Lukasiewicz's motivations for adding new truth values: readers interested in this topic will find appropriate references in Chapter 10. Also, we shall not explain why Lukasiewicz infinite-valued propositionallogic is a ba sic ingredient of any logical treatment of imprecise notions: Hajek's book in this series on Trends in Logic contains the most authorita tive explanations. However, in order to show that MV-algebras stand to infinite-valued logic as boolean algebras stand to two-valued logic, we shall devote Chapter 5 to Ulam's game of Twenty Questions with lies/errors, as a natural context where infinite-valued propositions, con nectives and inferences are used. While several other semantics for infinite-valued logic are known in the literature-notably Giles' game theoretic semantics based on subjective probabilities-still the transi tion from two-valued to many-valued propositonallogic can hardly be modelled by anything simpler than the transformation of the familiar game of Twenty Questions into Ulam game with lies/errors.
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Chang completeness theorem
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abelian group arbitrary atom boolean algebra C*-algebras Chang's Chapter coincides compact Hausdorff space complete MV-algebra completeness theorem Computer Cont(X Corollary defined Definition denote desired conclusion direct product equation holds Farey finite number following conditions formula free MV-algebras FreeK functor given group homomorphism Hausdorff space Hence hyperarchimedean i-group immediate consequence implicative filter induction infinite-valued calculus integer intersection of maximal isomorphism lattice-ordered Lemma Lindenbaum algebra linear many-valued logics Mathematics maximal ideals McNaughton functions monoid Mundici MV-chain MV-equations MV-term natural order Nola nonempty nontrivial MV-algebra notation obtain one-one operations ordered abelian group prime ideal proper ideal Proposition 3.1.4 propositional calculus prove quotient Rad(A rational numbers real numbers satisfying the following Schauder semisimple sequence simple MV-algebras stonean ideal strong unit subalgebra subdirect product subset Suppose surjective tautology theory tion topology toric varieties trivial Ulam game unimodular unique variables Xi vectors whence
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