Abstract
Gentzen-type sequent calculi GBD+, GBDe, GBD1, and GBD2 are respectively introduced for De and Omori’s axiomatic extensions BD+, BDe, BD1, and BD2 of Belnap–Dunn logic by adding classical negation. These calculi are constructed based on a small modification of the original characteristic axiom scheme for negated implication. Theorems for syntactically and semantically embedding these calculi into a Gentzen-type sequent calculus LK for classical logic are proved. The cut-elimination, decidability, and completeness theorems for these calculi are obtained using these embedding theorems. Similar results excluding cut-elimination results are also obtained for alternative Gentzen-type sequent calculi gBD+, gBDe, gBD1, and gBD2 for BD+, BDe, BD1, and BD2, respectively. These alternative calculi are constructed based on the original characteristic axiom scheme for negated implication.
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We would like to thank the anonymous referees for their valuable comments. This research was supported by JSPS KAKENHI Grant Numbers JP18K11171, JP16KK0007 and JSPS Core-to-Core Program (A. Advanced Research Networks).
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Kamide, N. Gentzen-Type Sequent Calculi for Extended Belnap–Dunn Logics with Classical Negation: A General Framework. Log. Univers. 13, 37–63 (2019). https://doi.org/10.1007/s11787-018-0218-3
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DOI: https://doi.org/10.1007/s11787-018-0218-3