On Modal μ-Calculus in S5 and Applications

  • Authors:
  • Giovanna D'Agostino;Giacomo Lenzi

  • Affiliations:
  • Dipartimento di Matematica e Informatica, Università di Udine, Via delle Scienze 206, 33100 Udine, Italy. giovanna.dagostino@uniud.it;Dipartimento di Matematica e Informatica, Università di Salerno, Via Ponte Don Melillo 1, 84084 Fisciano SA, Italy. gilenzi@unisa.it

  • Venue:
  • Fundamenta Informaticae - Special Issue on the Italian Conference on Computational Logic: CILC 2011
  • Year:
  • 2013

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Abstract

We consider the μ-calculus over graphs where the accessibility relation is an equivalence S5-graphs. We show that the vectorial μ-calculus model checking problem over arbitrary graphs reduces to the vectorial, existential μ-calculus model checking problem over S5 graphs. Moreover, we give a proof that satisfiability of μ-calculus in S5 is NP-complete, and by using S5 graphs we give a new proof that the satisfiability problem of the existential μ-calculus is also NP-complete. Finally we prove that on multimodal S5, in contrast with the monomodal case, the fixpoint hierarchy of the μ-calculus is infinite and the finite model property fails.