Three notes on the complexity of model checking fixpoint logic with chop
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Volume 41 (2007) no. 2, pp. 177-190.

This paper analyses the complexity of model checking fixpoint logic with Chop - an extension of the modal μ-calculus with a sequential composition operator. It uses two known game-based characterisations to derive the following results: the combined model checking complexity as well as the data complexity of FLC are EXPTIME-complete. This is already the case for its alternation-free fragment. The expression complexity of FLC is trivially P-hard and limited from above by the complexity of solving a parity game, i.e. in UPco-UP. For any fragment of fixed alternation depth, in particular alternation- free formulas it is P-complete.

DOI: 10.1051/ita:2007011
Classification: 03B44,  68Q17,  68Q60
Keywords: model checking, games, EXPTIME-complete
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Lange, Martin. Three notes on the complexity of model checking fixpoint logic with chop. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Volume 41 (2007) no. 2, pp. 177-190. doi : 10.1051/ita:2007011. http://www.numdam.org/articles/10.1051/ita:2007011/

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