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arXiv · 2103.16857

An extension of J\'{o}nsson-Tarski representation and model existence in predicate non-normal modal logics

Yoshihito Tanaka
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Abstract

In this paper, we give an extension of the J\'{o}nsson-Tarski representation theorem for both normal and non-normal modal algebras so that it preserves countably many infinitary meets and joins. To extend the J\'{o}nsson-Tarski representation to non-normal modal algebras we consider neighborhood frames instead of Kripke frames just as Do\v{s}en's duality theorem for modal algebras, and to deal with infinite meets and joins, we make use of Q-filters instead of prime filters. Then, we show that every predicate modal logic, whether it is normal or non-normal, has a model defined on a neighborhood frame with constant domains, and give completeness theorem for some predicate modal logics. We also show the same results for infinitary modal logics.

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Yoshihito Tanaka. 2021-03-31. An extension of J\'{o}nsson-Tarski representation and model existence in predicate non-normal modal logics. https://doi.org/10.1002/malq.202100018

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