Characterizing Definability in Decidable Fixpoint Logics

Authors Michael Benedikt, Pierre Bourhis, Michael Vanden Boom

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Michael Benedikt
Pierre Bourhis
Michael Vanden Boom

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Michael Benedikt, Pierre Bourhis, and Michael Vanden Boom. Characterizing Definability in Decidable Fixpoint Logics. In 44th International Colloquium on Automata, Languages, and Programming (ICALP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 80, pp. 107:1-107:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)


We look at characterizing which formulas are expressible in rich decidable logics such as guarded fixpoint logic, unary negation fixpoint logic, and guarded negation fixpoint logic. We consider semantic characterizations of definability, as well as effective characterizations. Our algorithms revolve around a finer analysis of the tree-model property and a refinement of the method of moving back-and-forth between relational logics and logics over trees.
  • Guarded logics
  • bisimulation
  • definability
  • automata


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