Abstract
We give sound and complete analytic tableau systems for the propositional bimodal logics KB, KB −C , KB −5, and KB −5C . These logics have two universal modal operators K and B, where K stands for knowing and B stands for believing. The logic KB is a combination of the modal logic S5 (for K) and KD45 (for B) with the interaction axioms I: K φ → B φ and C: B φ → KB φ. The logics KB −C , KB −5, KB −5C are obtained from KB respectively by deleting the axiom C (for KB −C ), the axioms 5 (for KB −5), and both of the axioms C and 5 (for KB −5C ). As analytic sequent-like tableau systems, our calculi give simple decision procedures for reasoning about both knowledge and belief in the mentioned logics.
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Nguyen, L.A. (2002). Analytic Tableau Systems for Propositional Bimodal Logics of Knowledge and Belief. In: Egly, U., Fermüller, C.G. (eds) Automated Reasoning with Analytic Tableaux and Related Methods. TABLEAUX 2002. Lecture Notes in Computer Science(), vol 2381. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45616-3_15
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DOI: https://doi.org/10.1007/3-540-45616-3_15
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