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STRONG COMPLETENESS OF MODAL LOGICS OVER 0-DIMENSIONAL METRIC SPACES

Published online by Cambridge University Press:  24 October 2019

ROBERT GOLDBLATT*
Affiliation:
School of Mathematics and Statistics, Victoria University of Wellington
IAN HODKINSON*
Affiliation:
Department of Computing, Imperial College London
*
*SCHOOL OF MATHEMATICS AND STATISTICS VICTORIA UNIVERSITY WELLINGTON, NEW ZEALAND E-mail: [email protected]
DEPARTMENT OF COMPUTING IMPERIAL COLLEGE LONDON LONDON, UK E-mail: [email protected]

Abstract

We prove strong completeness results for some modal logics with the universal modality, with respect to their topological semantics over 0-dimensional dense-in-themselves metric spaces. We also use failure of compactness to show that, for some languages and spaces, no standard modal deductive system is strongly complete.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 2019 

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