Abstract
Higher-Order Fixpoint Logic (HFL) is a modal specification language whose expressive power reaches far beyond that of Monadic Second-Order Logic, achieved through an incorporation of a typed \(\lambda \)-calculus into the modal \(\mu \)-calculus. Its model checking problem on finite transition systems is decidable, albeit of high complexity, namely k-EXPTIME-complete for formulas that use functions of type order at most \(k > 0\). In this paper we present a fragment with a presumably easier model checking problem. We show that so-called tail-recursive formulas of type order k can be model checked in \((k-1)\)-EXPSPACE, and also give matching lower bounds. This yields generic results for the complexity of bisimulation-invariant non-regular properties, as these can typically be defined in HFL.
F. Bruse—This work was supported by a fellowship within the FITweltweit programme of the German Academic Exchange Service (DAAD).
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Bruse, F., Lange, M., Lozes, E. (2017). Space-Efficient Fragments of Higher-Order Fixpoint Logic. In: Hague, M., Potapov, I. (eds) Reachability Problems. RP 2017. Lecture Notes in Computer Science(), vol 10506. Springer, Cham. https://doi.org/10.1007/978-3-319-67089-8_3
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