Quantified linear temporal logic (QLTL) is an ω-regular extension of LTL allowing quantification over propositional variables. We study the model checking problem of QLTL-formulas over Markov chains and Markov decision processes (MDPs) with respect to the number of quantifier alternations of formulas in prenex normal form. For formulas with k{-}1 quantifier alternations, we prove that all qualitative and quantitative model checking problems are k-EXPSPACE-complete over Markov chains and k{+}1-EXPTIME-complete over MDPs. As an application of these results, we generalize vacuity checking for LTL specifications from the non-probabilistic to the probabilistic setting. We show how to check whether an LTL-formula is affected by a subformula, and also study inherent vacuity for probabilistic systems.
@InProceedings{piribauer_et_al:LIPIcs.CONCUR.2021.7, author = {Piribauer, Jakob and Baier, Christel and Bertrand, Nathalie and Sankur, Ocan}, title = {{Quantified Linear Temporal Logic over Probabilistic Systems with an Application to Vacuity Checking}}, booktitle = {32nd International Conference on Concurrency Theory (CONCUR 2021)}, pages = {7:1--7:18}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-203-7}, ISSN = {1868-8969}, year = {2021}, volume = {203}, editor = {Haddad, Serge and Varacca, Daniele}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2021.7}, URN = {urn:nbn:de:0030-drops-143842}, doi = {10.4230/LIPIcs.CONCUR.2021.7}, annote = {Keywords: Quantified linear temporal logic, Markov chain, Markov decision process, vacuity} }
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