--- res: bibo_abstract: - We consider the satisfiability problem for modal logic over first-order definable classes of frames.We confirm the conjecture from Hemaspaandra and Schnoor [2008] that modal logic is decidable over classes definable by universal Horn formulae. We provide a full classification of Horn formulae with respect to the complexity of the corresponding satisfiability problem. It turns out, that except for the trivial case of inconsistent formulae, local satisfiability is eitherNP-complete or PSPACE-complete, and global satisfiability is NP-complete, PSPACE-complete, or ExpTime-complete. We also show that the finite satisfiability problem for modal logic over Horn definable classes of frames is decidable. On the negative side, we show undecidability of two related problems. First, we exhibit a simple universal three-variable formula defining the class of frames over which modal logic is undecidable. Second, we consider the satisfiability problem of bimodal logic over Horn definable classes of frames, and also present a formula leading to undecidability.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Jakub foaf_name: Michaliszyn, Jakub foaf_surname: Michaliszyn - foaf_Person: foaf_givenName: Jan foaf_name: Otop, Jan foaf_surname: Otop foaf_workInfoHomepage: http://www.librecat.org/personId=2FC5DA74-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Emanuel foaf_name: Kieroňski, Emanuel foaf_surname: Kieroňski bibo_doi: 10.1145/2817825 bibo_issue: '1' bibo_volume: 17 dct_date: 2015^xs_gYear dct_language: eng dct_publisher: ACM@ dct_title: On the decidability of elementary modal logics@ ...