A New S4 Classical Modal Logic in Natural Deduction

Journal of Symbolic Logic 71 (3):799 - 809 (2006)
We show, first, that the normalization procedure for S4 modal logic presented by Dag Prawitz in [5] does not work. We then develop a new natural deduction system for S4 classical modal logic that is logically equivalent to that of Prawitz, and we show that every derivation in this new system can be transformed into a normal derivation
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DOI 10.2178/jsl/1154698578
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References found in this work BETA
On an Intuitionistic Modal Logic.G. M. Bierman & V. C. V. de Paiva - 2000 - Studia Logica 65 (3):383-416.

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Proof Theory for Modal Logic.Sara Negri - 2011 - Philosophy Compass 6 (8):523-538.

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