Three-valued abstractions of Markov chains: completeness for a sizeable fragment of PCTL

  • Authors:
  • Michael Huth;Nir Piterman;Daniel Wagner

  • Affiliations:
  • Department of Computing, Imperial College London, London, United Kingdom;Department of Computing, Imperial College London, London, United Kingdom;Department of Computing, Imperial College London, London, United Kingdom

  • Venue:
  • FCT'09 Proceedings of the 17th international conference on Fundamentals of computation theory
  • Year:
  • 2009

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Abstract

Three-valued Markov chains and their PCTL semantics abstract - via probabilistic simulations - labeled Markov chains and their usual PCTL semantics. This abstraction framework is complete for a PCTL formula if all labeled Markov chains that satisfy said formula have a finite-state abstraction that satisfies it in its abstract semantics. We show that not all PCTL formulae are complete for this abstraction framework. But PCTL formulae whose path modalities occur in a suitable combination of negation polarity and threshold type are proved to be complete, where abstractions are bounded, 3-valued unfoldings of their concrete labeled Markov chains. This set of complete PCTL formulae subsumes widely used PCTL patterns.