Abstract
The language of Belnap–Dunn modal logic \({\mathscr {L}}_0\) expands the language of Belnap–Dunn four-valued logic (having constant symbols for the values 0 and 1) with the modal operator \(\Box \). We introduce the polarity semantics for \({\mathscr {L}}_0\) and its two expansions \({\mathscr {L}}_1\) and \({\mathscr {L}}_2\) with value operators. The local finitary consequence relation \(\models _4^k\) in the language \({\mathscr {L}}_k\) with respect to the class of all frames is axiomatized by a sequent system \(\mathsf {S}_k\) where \(k=0, 1, 2\). We prove by using translations between sequents and formulas that these languages under the polarity semantics have the same expressive power on the level of frames with the language \({\mathscr {L}}_0\) under the relational semantics for classical modal logic.
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02 July 2021
The DOI URL in the reference [24] was incorrectly published. It has been corrected from https://doi.org/10.1017/s17550203119000121 to https://doi.org/10.1017S1755020319000121.
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The fund was provide by Chinese National Funding of Social Sciences (Grant No. 18ZDA033).
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Lin, Y., Ma, M. Belnap–Dunn Modal Logic with Value Operators. Stud Logica 109, 759–789 (2021). https://doi.org/10.1007/s11225-020-09925-y
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DOI: https://doi.org/10.1007/s11225-020-09925-y