Development of a contraction-free BI sequent calculus, be the contraction-freeness implicit or explicit, has not been successful in the literature. We address this problem by presenting such a sequent system. Our calculus involves no structural rules. It should be an insight into non-formula contraction absorption in other non-classical logics. Contraction absorption in sequent calculus is associated to simpler cut elimination and to efficient proof searches.
@InProceedings{arisaka:LIPIcs.FSCD.2016.8, author = {Arisaka, Ryuta}, title = {{Structural Interactions and Absorption of Structural Rules in BI Sequent Calculus}}, booktitle = {1st International Conference on Formal Structures for Computation and Deduction (FSCD 2016)}, pages = {8:1--8:18}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-010-1}, ISSN = {1868-8969}, year = {2016}, volume = {52}, editor = {Kesner, Delia and Pientka, Brigitte}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSCD.2016.8}, URN = {urn:nbn:de:0030-drops-59742}, doi = {10.4230/LIPIcs.FSCD.2016.8}, annote = {Keywords: cut-elimination, contraction-free, sequent calculus, proof theory, BI, logic combination} }
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