Abstract
Different natural deduction proof systems for intuitionistic and classical logic —and related logical systems—differ in fundamental properties while sharing significant family resemblances. These differences become quite stark when it comes to the structural rules of contraction and weakening. In this paper, I show how Gentzen and Jaśkowski’s natural deduction systems differ in fine structure. I also motivate directed proof nets as another natural deduction system which shares some of the design features of Genzen and Jaśkowski’s systems, but which differs again in its treatment of the structural rules, and has a range of virtues absent from traditional natural deduction systems.
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Special Issue: Gentzen’s and Jaśkowski’s Heritage 80 Years of Natural Deduction and Sequent Calculi
Edited by Andrzej Indrzejczak
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Restall, G. Normal Proofs, Cut Free Derivations and Structural Rules. Stud Logica 102, 1143–1166 (2014). https://doi.org/10.1007/s11225-014-9598-4
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DOI: https://doi.org/10.1007/s11225-014-9598-4