Abstract
Modal logics are widely used in computer science. The complexity of their satisfiability problems has been an active field of research since the 1970s. We prove that even very “simple” modal logics can be undecidable: We show that there is an undecidable unimodal logic that can be obtained by restricting the allowed models with an equality-free first-order formula in which only universal quantifiers appear.
Supported in part by NSF grant IIS-0713061, the DAAD postdoc program, and by a Friedrich Wilhelm Bessel Research Award. Work done in part while Henning Schnoor was at the Rochester Institute of Technology.
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Hemaspaandra, E., Schnoor, H. (2011). A Universally Defined Undecidable Unimodal Logic. In: Murlak, F., Sankowski, P. (eds) Mathematical Foundations of Computer Science 2011. MFCS 2011. Lecture Notes in Computer Science, vol 6907. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22993-0_34
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DOI: https://doi.org/10.1007/978-3-642-22993-0_34
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