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A Note on the Issue of Cohesiveness in Canonical Models
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Journal Article
A Note on the Issue of Cohesiveness in Canonical Models
2020
Overview
In their presentation of canonical models for normal systems of modal logic, Hughes and Cresswell observe that some of these models are based on a frame which can be also thought of as a collection of two or more isolated frames; they call such frames ‘non-cohesive’. The problem of checking whether the canonical model of a given system is cohesive is still rather unexplored and no general decision procedure is available. The main contribution of this article consists in introducing a method which is sufficient to show that canonical models of some relevant classes of normal monomodal and bimodal systems are always non-cohesive.
Publisher
Springer Netherlands,Springer Nature B.V
