On the Closure Properties of the Class of Full G-models of a Deductive System |
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| Authors: | Josep Maria Font Ramon Jansana Don Pigozzi |
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| Institution: | (1) Department of Probability, Logic and Statistics, Faculty of Mathematics, University of Barcelona, Gran Via 585, E-08007 Barcelona, Spain;(2) Department of Logic, History and Philosophy of Science, Faculty of Philosophy, University of Barcelona, Baldiri Reixach, s/n, E-08028 Barcelona, Spain;(3) Department of Mathematics, Iowa State University, Ames, 50011, IA, U.S.A. |
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| Abstract: | In this paper we consider the structure of the class FGModS of full generalized models of a deductive system S from a universal-algebraic point of view, and the structure of the set of all the full generalized models of S on a fixed algebra A from the lattice-theoretical point of view; this set is represented by the lattice FACSs A of all algebraic closed-set systems C on A such that (A, C) ε FGModS. We relate some properties of these structures with tipically logical properties of the sentential logic S. The main algebraic properties we consider are the closure of FGModS under substructures and under reduced products, and the property that for any A the lattice FACSs A is a complete sublattice of the lattice of all algebraic closed-set systems over A. The logical properties are the existence
of a fully adequate Gentzen system for S, the Local Deduction Theorem and the Deduction Theorem for S. Some of the results are established for arbitrary deductive systems, while some are found to hold only for deductive systems
in more restricted classes like the protoalgebraic or the weakly algebraizable ones. The paper ends with a section on examples
and counterexamples.
Dedicated to the memory of Willem Johannes Blok |
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| Keywords: | abstract algebraic logic protoalgebraic logic algebraizable logic Leibniz congruence Tarski congruence generalized matrix full generalized model fully adequate Gentzen system |
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