Daniel Hausmann ; Lutz Schröder - Coalgebraic Satisfiability Checking for Arithmetic $\mu$-Calculi

lmcs:10532 - Logical Methods in Computer Science, July 23, 2024, Volume 20, Issue 3 - https://doi.org/10.46298/lmcs-20(3:9)2024
Coalgebraic Satisfiability Checking for Arithmetic $\mu$-CalculiArticle

Authors: Daniel Hausmann ORCID; Lutz Schröder ORCID

    The coalgebraic $\mu$-calculus provides a generic semantic framework for fixpoint logics over systems whose branching type goes beyond the standard relational setup, e.g. probabilistic, weighted, or game-based. Previous work on the coalgebraic $\mu$-calculus includes an exponential-time upper bound on satisfiability checking, which however relies on the availability of tableau rules for the next-step modalities that are sufficiently well-behaved in a formally defined sense; in particular, rule matches need to be representable by polynomial-sized codes, and the sequent duals of the rules need to absorb cut. While such rule sets have been identified for some important cases, they are not known to exist in all cases of interest, in particular ones involving either integer weights as in the graded $\mu$-calculus, or real-valued weights in combination with non-linear arithmetic. In the present work, we prove the same upper complexity bound under more general assumptions, specifically regarding the complexity of the (much simpler) satisfiability problem for the underlying one-step logic, roughly described as the nesting-free next-step fragment of the logic. The bound is realized by a generic global caching algorithm that supports on-the-fly satisfiability checking. Notably, our approach directly accommodates unguarded formulae, and thus avoids use of the guardedness transformation. Example applications include new exponential-time upper bounds for satisfiability checking in an extension of the graded $\mu$-calculus with polynomial inequalities (including positive Presburger arithmetic), as well as an extension of the (two-valued) probabilistic $\mu$-calculus with polynomial inequalities.


    Volume: Volume 20, Issue 3
    Published on: July 23, 2024
    Accepted on: May 5, 2024
    Submitted on: December 22, 2022
    Keywords: Computer Science - Logic in Computer Science,03B70, 03B44,F.4.1

    Classifications

    Mathematics Subject Classification 20201

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