Discrete Linear-time Probabilistic Logics: Completeness, Decidability and Complexity

  • Authors:
  • Zoran Ognjanović

  • Affiliations:
  • Matematički Institut, Kneza Mihaila 35, 11000 Beograd, Srbija i Crna Gora. Email: zorano@mi.sanu.ac.yu

  • Venue:
  • Journal of Logic and Computation
  • Year:
  • 2006

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Abstract

We introduce a propositional and a first-order logic for reasoning about discrete linear time and finitely additive probability. The languages of these logics allow formulae that say 'sometime in the future, α holds with probability at least s'. We restrict our study to so-called measurable models. We provide sound and complete infinitary axiomatizations for the logics. Furthermore, in the propositional case decidability is proved by establishing a periodicity argument for ω-sequences extending the decidability proof of standard propositional temporal logic LTL. Complexity issues are examined and a worst-case complexity upper bound is given. Extensions of the presented results and open problems are described in the final part of the paper.