Abstract
We identify two wide families of propositional sequent calculi for which cut-admissibility is a corollary of the subformula property. While the subformula property is often a simple consequence of cut-admissibility, our results shed light on the converse direction, and may be used to simplify cut-admissibility proofs in various propositional sequent calculi. In particular, the results of this paper may be used in conjunction with existing methods that establish the subformula property, to obtain that cut-admissibility holds as well.
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Notes
- 1.
Note that by defining sequents to be pairs of sets we implicitly include other standard structural rules, such as exchange and contraction.
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Acknowledgments
This research was supported by The Israel Science Foundation (grant no. 817-15). We thank Arnon Avron, João Marcos and the TABLEAUX’17 reviewers for their helpful feedback.
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Lahav, O., Zohar, Y. (2017). Cut-Admissibility as a Corollary of the Subformula Property. In: Schmidt, R., Nalon, C. (eds) Automated Reasoning with Analytic Tableaux and Related Methods. TABLEAUX 2017. Lecture Notes in Computer Science(), vol 10501. Springer, Cham. https://doi.org/10.1007/978-3-319-66902-1_4
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