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Finite and finitely separable intermediate propositional logics

Published online by Cambridge University Press:  12 March 2014

Fabio Bellissima
Fabio Bellissima*
Affiliation:
Dipartimento di Matematica, Università Degli Studi di Siena, 53100 Siena, Italy
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Extract

§0. Introduction and material background. The present paper is devoted to the study of intermediate propositional logics, and it is based on [Be, §§1 and 2].

§2 (§§0 and 1 are introductory) concerns the axiomatization of finite logics. In the literature several effective procedures to axiomatize finite logics are present (cf., for instance, [MK] and [Wr]), but, in each case, the number of propositional variables which are used is redundant. In this direction, Theorem 2.2 provides (a) a criterion to determine, given a finite logic L, the least n such that L is axiomatizable by formulas in n variables, and (b) an effective axiomatization by an n-formula. As a corollary we obtain a negative answer to Problem 7.10 of [Ho/On], showing that there is no connection between the slice to which L belongs and the number of propositional variables necessary to axiomatize L.

The principal results of the paper are in §3. In fact, a great deal of research has been done on the correspondence between conditions on the relation of Kripke-structures from one side, and axioms added to Int from the other. In this section we (a) introduce the concept of finitely separable class of Kripke-frames, and show, by means of several examples, that this concept is “wide”, in the sense that all the most studied classes of frames determined by semantical conditions are finitely separable; (b) show that each finitely separable class is axiomatizable, and that the axioms can be found by means of semantical considerations only; and (c) establish the finite model property for all the finitely separable logics.

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Type
Research Article
Information
The Journal of Symbolic Logic , Volume 53 , Issue 2 , June 1988 , pp. 403 - 420
Copyright
Copyright © Association for Symbolic Logic 1988

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References

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