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THREE MODEL-THEORETIC CONSTRUCTIONS FOR GENERALIZED EPSTEIN SEMANTICS

Part of: Model theory General logic

Published online by Cambridge University Press:  08 July 2021

KRZYSZTOF A. KRAWCZYK
KRZYSZTOF A. KRAWCZYK*
Affiliation:
DEPARTMENT OF LOGIC NICOLAUS COPERNICUS UNIVERSITY IN TORUŃ TORUŃ, POLAND E-mail: krawczyk@doktorant.umk.pl
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Abstract

This paper introduces three model-theoretic constructions for generalized Epstein semantics: reducts, ultramodels and $\textsf {S}$-sets. We apply these notions to obtain metatheoretical results. We prove connective inexpressibility by means of a reduct, compactness by an ultramodel and definability theorem which states that a set of generalized Epstein models is definable iff it is closed under ultramodels and $\textsf {S}$-sets. Furthermore, a corollary concerning definability of a set of models by a single formula is given on the basis of the main theorem and the compactness theorem. We also provide an example of a natural set of generalized Epstein models which is undefinable. Its undefinability is proven by means of an $\textsf {S}$-set.

Keywords

Epstein semanticsS-setultramodelreductdefinability

MSC classification

Primary: 03B60: Other nonclassical logic
Secondary: 03C20: Ultraproducts and related constructions 03C80: Logic with extra quantifiers and operators
Type
Research Article
Information
The Review of Symbolic Logic , Volume 15 , Issue 4 , December 2022 , pp. 1023 - 1032
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of The Association for Symbolic Logic

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