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The geometry of non-distributive logics

Published online by Cambridge University Press:  12 March 2014

Greg Restall
Department of Philosophy, The University of Melbourne, Victoria 3010, Australia, E-mail:
Francesco Paoli
Dipartimento di Scienze Pedagogiche e Filosofiche, Università di Cagliari, Via Ls Mirrionis 1, 09123 Cagliari, Italy, E-mail:


In this paper we introduce a new natural deduction system for the logic of lattices, and a number of extensions of lattice logic with different negation connectives. We provide the class of natural deduction proofs with both a standard inductive definition and a global graph-theoretical criterion for correctness, and we show how normalisation in this system corresponds to cut elimination in the sequent calculus for lattice logic. This natural deduction system is inspired both by Shoesmith and Smiley's multiple conclusion systems for classical logic and Girard's proofnets for linear logic.

Research Article
Copyright © Association for Symbolic Logic 2005

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