Almost duplication-free tableau calculi for prepositional lax logics

  • Alessandro Avellone
  • Mauro Ferrari
Contributed Papers
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1071)


In this paper we provide tableau calculi for the intuitionistic modal logics PLL and PLL1, where the calculus for PLL1 is duplication-free while among the rules for PLL there is just one rule that allows duplication of formulas. These logics have been investigated by Fairtlough and Mendler in relation to the problem of Formal Hardware Verification. In order to develop these calculi we extend to the modal case some ideas presented by Miglioli, Moscato and Ornaghi for intuitionistic logic. Namely, we enlarge the language containing the usual sings T and F with the new sign Fc. PLL and PLL1 logics are characterized by a Kripke-semantics which is a “weak” version of the semantics for ordinary intuitionistic modal logics. In this paper we establish the soundness and completeness theorems for these calculi.


intuitionistic modal logics refutation systems duplications 


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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  1. 1.Dipartimento di Scienze dell'InformazioneUniversità degli Studi di MilanoMilanoItaly

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