Decidability of Hybrid Logic with Local Common Knowledge Based on Linear Temporal Logic LTL

  • Authors:
  • Sergey Babenyshev;Vladimir Rybakov

  • Affiliations:
  • Manchester Metropolitan University, Manchester, U.K. and Siberian Federal University, Krasnoyarsk, Russia;Manchester Metropolitan University, Manchester, U.K. and Siberian Federal University, Krasnoyarsk, Russia

  • Venue:
  • CiE '08 Proceedings of the 4th conference on Computability in Europe: Logic and Theory of Algorithms
  • Year:
  • 2008

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Abstract

Our paper considers a hybrid $\mathrm{LTL}_{\mathcal{ACK}}$ between the multi-agent logic with the local common knowledge operation and an extended version of the linear temporal logic $\mathcal{LTL}$. The logic is based on the semantics of Kripe/Hintikka models with potentially infinite runs and the time points represented by clusters of states with agents' accessibility relations. We study the satisfiability problem for $\mathrm{LTL}_{\mathcal{ACK}}$ and related decidability problem. The key result is an algorithm which recognizes theorems of $\mathrm{LTL}_{\mathcal{ACK}}$ (so we show that $\mathrm{LTL}_{\mathcal{ACK}}$ is decidable), which, as a consequence, also solves the satisfiability problem. Technique is based on verification of validity for special normal reduced forms of rules in models of double exponential in the size of rules.