Abstract
In this study, we introduce Gentzen-type sequent calculi BDm and BDi for a modal extension and an intuitionistic modification, respectively, of De and Omori’s extended Belnap–Dunn logic BD+ with classical negation. We prove theorems for syntactically and semantically embedding BDm and BDi into Gentzen-type sequent calculi S4 and LJ for normal modal logic and intuitionistic logic, respectively. The cut-elimination, decidability, and completeness theorems for BDm and BDi are obtained using these embedding theorems. Moreover, we prove the Glivenko theorem for embedding BD+ into BDi and the McKinsey–Tarski theorem for embedding BDi into BDm.
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Notes
Negation of this kind, which appears in Belnap–Dunn logic, is also referred to as De Morgan negation.
The name “LK” is from Gentzen’s original sequent calculus LK for first-order classical logic (Gentzen 1969). However, in this paper, the name LK is used for a non-essential modification of the propositional fragment of the original LK.
The name “LJ” is from Gentzen’s original sequent calculus LJ for first-order intuitionistic logic (Gentzen 1969). However, in this paper, the name LJ is used for a non-essential modification of the propositional fragment of the original LJ.
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Acknowledgements
We would like to thank the anonymous referees for their valuable comments and suggestions. This work was supported by JSPS KAKENHI Grant Numbers JP18K11171 and JP16KK0007.
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Kamide, N. Modal and Intuitionistic Variants of Extended Belnap–Dunn Logic with Classical Negation. J of Log Lang and Inf 30, 491–531 (2021). https://doi.org/10.1007/s10849-021-09330-1
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DOI: https://doi.org/10.1007/s10849-021-09330-1