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MODAL LOGICS OF METRIC SPACES

Published online by Cambridge University Press:  18 December 2014

GURAM BEZHANISHVILI ,
DAVID GABELAIA  and
JOEL LUCERO-BRYAN
GURAM BEZHANISHVILI*
Affiliation:
Department of Mathematical Sciences, New Mexico State University
DAVID GABELAIA*
Affiliation:
A. Razmadze Mathematical Institute, Tbilisi State University
JOEL LUCERO-BRYAN*
Affiliation:
Department of Applied Mathematics and Sciences, Khalifa University
*
*DEPARTMENT OF MATHEMATICAL SCIENCES, NEW MEXICO STATE UNIVERSITY, LAS CRUCES NM 88003, USA E-mail:guram@math.nmsu.edu
†A. RAZMADZE MATHEMATICAL INSTITUTE, TBILISI STATE UNIVERSITY, 6 TAMARASHVILI STR., TBILISI 0177, GEORGIA E-mail:gabelaia@gmail.com
‡DEPARTMENT OF APPLIED MATHEMATICS AND SCIENCES, KHALIFA UNIVERSITY, ABU DHABI, UAE E-mail:joel.lucero-bryan@kustar.ac.ae
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Abstract

It is a classic result (McKinsey & Tarski, 1944; Rasiowa & Sikorski, 1963) that if we interpret modal diamond as topological closure, then the modal logic of any dense-in-itself metric space is the well-known modal system S4. In this paper, as a natural follow-up, we study the modal logic of an arbitrary metric space. Our main result establishes that modal logics arising from metric spaces form the following chain which is order-isomorphic (with respect to the ⊃ relation) to the ordinal ω + 3:

$S4.Gr{z_1} \supset S4.Gr{z_2} \supset S4.Gr{z_3} \supset \cdots \,S4.Grz \supset S4.1 \supset S4.$

It follows that the modal logic of an arbitrary metric space is finitely axiomatizable, has the finite model property, and hence is decidable.

Type
Research Article
Information
The Review of Symbolic Logic , Volume 8 , Issue 1 , March 2015 , pp. 178 - 191
Copyright
Copyright © Association for Symbolic Logic 2014 

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References

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