,
Takeshi Tsukada
Creative Commons Attribution 3.0 Unported license
We introduce PHFL, a probabilistic extension of higher-order fixpoint logic, which can also be regarded as a higher-order extension of probabilistic temporal logics such as PCTL and the μ^p-calculus. We show that PHFL is strictly more expressive than the μ^p-calculus, and that the PHFL model-checking problem for finite Markov chains is undecidable even for the μ-only, order-1 fragment of PHFL. Furthermore the full PHFL is far more expressive: we give a translation from Lubarsky’s μ-arithmetic to PHFL, which implies that PHFL model checking is Π^1₁-hard and Σ^1₁-hard. As a positive result, we characterize a decidable fragment of the PHFL model-checking problems using a novel type system.
@InProceedings{mitani_et_al:LIPIcs.FSCD.2020.19,
author = {Mitani, Yo and Kobayashi, Naoki and Tsukada, Takeshi},
title = {{A Probabilistic Higher-Order Fixpoint Logic}},
booktitle = {5th International Conference on Formal Structures for Computation and Deduction (FSCD 2020)},
pages = {19:1--19:22},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-155-9},
ISSN = {1868-8969},
year = {2020},
volume = {167},
editor = {Ariola, Zena M.},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2020.19},
URN = {urn:nbn:de:0030-drops-123413},
doi = {10.4230/LIPIcs.FSCD.2020.19},
annote = {Keywords: Probabilistic logics, higher-order fixpoint logic, model checking}
}