Tree automata, Mu-Calculus and determinacy
SFCS '91 Proceedings of the 32nd annual symposium on Foundations of computer science
Deciding the winner in parity games is in UP ∩ co-UP
Information Processing Letters
Model checking
Reasoning About Knowledge
On the universal and existential fragments of the μ-calculus
Theoretical Computer Science - Tools and algorithms for the construction and analysis of systems (TACAS 2003)
Sequent Calculi for the Modal µ-Calculus over S5
Journal of Logic and Computation
On the μ-calculus over transitive and finite transitive frames
Theoretical Computer Science
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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.