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A fully labelled proof system for intuitionistic modal logics

Abstract : Labelled proof theory has been famously successful for modal logics by mimicking their relational seman- tics within deductive systems. Simpson in particular designed a framework to study a variety of intuitionistic modal logics integrating a binary relation symbol in the syntax. In this paper, we present a labelled sequent system for intuitionistic modal logics such that there is not only one, but two relation symbols appearing in sequents: one for the accessibility relation associated with the Kripke semantics for normal modal logics and one for the preorder relation associated with the Kripke semantics for intuitionistic logic. This puts our system in close correspondence with the standard birelational Kripke semantics for intuitionistic modal logics. As a consequence it can be extended with arbitrary intuitionistic Scott-Lemmon axioms. We show soundness and completeness, together with an internal cut elimination proof, encompassing a wider array of intuitionistic modal logics than any existing labelled system.
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https://hal.inria.fr/hal-02390454
Contributor : Lutz Straßburger <>
Submitted on : Friday, October 30, 2020 - 11:34:03 AM
Last modification on : Sunday, November 1, 2020 - 3:24:41 AM

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Sonia Marin, Marianela Morales, Lutz Straßburger. A fully labelled proof system for intuitionistic modal logics. 2019. ⟨hal-02390454v2⟩

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