Mathematics > Logic
[Submitted on 23 Apr 2018 (v1), last revised 5 May 2018 (this version, v2)]
Title:Restricted Interpolation and Lack Thereof in Stit Logic
View PDFAbstract:We consider the propositional logic equipped with Chellas stit operators for a finite set of individual agents plus the historical necessity modality. We settle the question of whether such a logic enjoys restricted interpolation property, which requires the existence of an interpolant only in cases where the consequence contains no Chellas stit operators occurring in the premise. We show that if action operators count as logical symbols, then such a logic has restricted interpolation property iff the number of agents does not exceed three. On the other hand, if action operators are considered to be non-logical symbols, the restricted interpolation fails for any number of agents exceeding one. It follows that unrestricted Craig interpolation also fails for almost all versions of stit logic.
Submission history
From: Grigory Olkhovikov [view email][v1] Mon, 23 Apr 2018 09:30:41 UTC (22 KB)
[v2] Sat, 5 May 2018 13:48:40 UTC (23 KB)
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