Abstract
Earlier algebraic semantics for Belnapian modal logics were defined in terms of twist-structures over modal algebras. In this paper we introduce the class of BK-lattices, show that this class coincides with the abstract closure of the class of twist-structures, and it forms a variety. We prove that the lattice of subvarieties of the variety of BK-lattices is dually isomorphic to the lattice of extensions of Belnapian modal logic BK. Finally, we describe invariants determining a twist-structure over a modal algebra.
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In memoriam Leo Esakia
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Odintsov, S.P., Latkin, E.I. BK-lattices. Algebraic Semantics for Belnapian Modal Logics. Stud Logica 100, 319–338 (2012). https://doi.org/10.1007/s11225-012-9380-4
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DOI: https://doi.org/10.1007/s11225-012-9380-4