Definability in the class of all -frames – computability and complexity

Journal of Applied Non-Classical Logics 27 (1-2):1-26 (2017)
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Abstract

In the basic modal language and in the basic modal language with the added universal modality, first-order definability of all formulas over the class of all frames is shown. Also, it is shown that the problems of modal definability of first-order sentences over the class of all frames in the languages and are both PSPACE-complete.

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References found in this work

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An essay in classical modal logic.Krister Segerberg - 1971 - Uppsala,: Filosofiska föreningen och Filosofiska institutionen vid Uppsala universitet.

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