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dc.contributor.authorRestall, Greg
dc.date.accessioned2023-10-12T10:06:01Z
dc.date.available2023-10-12T10:06:01Z
dc.date.issued2023-06-25
dc.identifier.issn0138-0680
dc.identifier.urihttp://hdl.handle.net/11089/48069
dc.description.abstractNatural deduction with alternatives extends Gentzen–Prawitz-style natural deduction with a single structural addition: negatively signed assumptions, called alternatives. It is a mildly bilateralist, single-conclusion natural deduction proof system in which the connective rules are unmodi_ed from the usual Prawitz introduction and elimination rules — the extension is purely structural. This framework is general: it can be used for (1) classical logic, (2) relevant logic without distribution, (3) affine logic, and (4) linear logic, keeping the connective rules fixed, and varying purely structural rules.The key result of this paper is that the two principles that introduce kinds of irrelevance to natural deduction proofs: (a) the rule of explosion (from a contradiction, anything follows); and (b) the structural rule of vacuous discharge; are shown to be two sides of a single coin, in the same way that they correspond to the structural rule of weakening in the sequent calculus. The paper also includes a discussion of assumption classes, and how they can play a role in treating additive connectives in substructural natural deduction.en
dc.language.isoen
dc.publisherWydawnictwo Uniwersytetu Łódzkiegopl
dc.relation.ispartofseriesBulletin of the Section of Logic;2en
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectproofen
dc.subjectnatural deductionen
dc.subjectclassical logicen
dc.subjectbilateralismen
dc.subjectsubstructural logicsen
dc.titleStructural Rules in Natural Deduction with Alternativesen
dc.typeOther
dc.page.number109-143
dc.contributor.authorAffiliationUniversity of St. Andrews, Department of Philosophy, Edgecliffe, The Scores Scotland, UKen
dc.identifier.eissn2449-836X
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dc.contributor.authorEmailgr69@st-andrews.ac.uk
dc.identifier.doi10.18778/0138-0680.2023.6
dc.relation.volume52


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