On Displaying Negative Modalities

Sergey Drobyshevich

DOI: http://dx.doi.org/10.12775/LLP.2017.023


We extend Takuro Onishi’s result on displaying substructural negations by formulating display calculi for non-normal versions of impossibility and unnecessity operators, called regular and co-regular negations, respectively, by Dimiter Vakarelov. We make a number of connections between Onishi’s work and Vakarelov’s study of negation. We also prove a decidability result for our display calculus, which can be naturally extended to obtain decidability results for a large number of display calculi for logics with negative modal operators.


display calculus; bi-intuitionistic logic; negative modalities; unnecessity; impossibility; decidability; distributive logic

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