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From 2-Sequents and Linear Nested Sequents to Natural Deduction for Normal Modal Logics

Published:28 June 2021Publication History
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Abstract

We extend to natural deduction the approach of Linear Nested Sequents and of 2-Sequents. Formulas are decorated with a spatial coordinate, which allows a formulation of formal systems in the original spirit of natural deduction: only one introduction and one elimination rule per connective, no additional (structural) rule, no explicit reference to the accessibility relation of the intended Kripke models. We give systems for the normal modal logics from K to S4. For the intuitionistic versions of the systems, we define proof reduction, and prove proof normalization, thus obtaining a syntactical proof of consistency. For logics K and K4 we use existence predicates (à la Scott) for formulating sound deduction rules.

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      • Published in

        cover image ACM Transactions on Computational Logic
        ACM Transactions on Computational Logic  Volume 22, Issue 3
        July 2021
        186 pages
        ISSN:1529-3785
        EISSN:1557-945X
        DOI:10.1145/3470626
        • Editor:
        • Orna Kupferman
        Issue’s Table of Contents

        Copyright © 2021 Association for Computing Machinery.

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        Publication History

        • Published: 28 June 2021
        • Accepted: 1 April 2021
        • Revised: 1 January 2021
        • Received: 1 July 2020
        Published in tocl Volume 22, Issue 3

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