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A tableau method for checking rule admissibility in S4. (English) Zbl 1345.03033
Bolander, Thomas (ed.) et al., Proceedings of the 6th workshop on methods for modalities (M4M-6 2009), Copenhagen, Denmark, November 12–14, 2009. Amsterdam: Elsevier. Electronic Notes in Theoretical Computer Science 262, 17-32 (2010).
Summary: Rules that are admissible can be used in any derivations in any axiomatic system of a logic. In this paper we introduce a method for checking the admissibility of rules in the modal logic S4. Our method is based on a standard semantic ground tableau approach. In particular, we reduce rule admissibility in S4 to satisfiability of a formula in a logic that extends S4. The extended logic is characterised by a class of models that satisfy a variant of the co-cover property. The class of models can be formalised by a well-defined first-order specification. Using a recently introduced framework for synthesising tableau decision procedures this can be turned into a sound, complete and terminating tableau calculus for the extended logic, and gives a tableau-based method for determining the admissibility of rules.
For the entire collection see [Zbl 1281.03003].

MSC:
03B45 Modal logic (including the logic of norms)
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