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A Uniform Tableau Method for Intuitionistic Modal Logics I

Giambattista Amati and Fiora Pirri
Studia Logica: An International Journal for Symbolic Logic
Vol. 53, No. 1 (Feb., 1994), pp. 29-60
Published by: Springer
Stable URL: http://www.jstor.org/stable/20015706
Page Count: 32
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A Uniform Tableau Method for Intuitionistic Modal Logics I
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Abstract

We present tableau systems and sequent calculi for the intuitionistic analogues IK, ID, IT, IKB, IKDB, IB, IK4, IKD4, IS4, IKB4, IK5, IKD5, IK45, IKD45 and IS5 of the normal classical modal logics. We provide soundness and completeness theorems with respect to the models of intuitionistic logic enriched by a modal accessibility relation, as proposed by G. Fischer Servi. We then show the disjunction property for IK, ID, IT, IKB, IKDB, IB, IK4, IKD4, IS4, IKB4, IK5, IK45 and IS5. We also investigate the relationship of these logics with some other intuitionistic modal logics proposed in the literature.

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