Classical Natural Deduction for S4 Modal Logic

  • Authors:
  • Daisuke Kimura;Yoshihiko Kakutani

  • Affiliations:
  • Department of Computer Science, University of Tokyo, Tokyo, Japan 113-8656;Department of Computer Science, University of Tokyo, Tokyo, Japan 113-8656

  • Venue:
  • APLAS '09 Proceedings of the 7th Asian Symposium on Programming Languages and Systems
  • Year:
  • 2009

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Abstract

This paper proposes a natural deduction system CNDS4 for classical S4 modal logic with necessity and possibility modalities. This new system is an extension of Parigot's Classical Natural Deduction with dual-context to formulate S4 modal logic. The modal ***μ -calculus is also introduced as a computational extraction of CNDS4. It is an extension of both the ***μ -calculus and the modal *** -calculus. Subject reduction, confluency, and strong normalization of the modal ***μ -calculus are shown. Finally, the computational interpretation of the modal ***μ -calculus, especially the computational meaning of the modal possibility operator, is discussed.