Symmetric normalisation for intuitionistic logic

Nicolas Guenot, Lutz Straßburger

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We present two proof systems for implication-only intuitionistic logic in the calculus of structures. The first is a direct adaptation of the standard sequent calculus to the deep inference setting, and we describe a procedure for cut elimination, similar to the one from the sequent calculus, but using a non-local rewriting. The second system is the symmetric completion of the first, as normally given in deep inference for logics with a DeMorgan duality: all inference rules have duals, as cut is dual to the identity axiom. We prove a generalisation of cut elimination, that we call symmetric normalisation, where all rules dual to standard ones are permuted up in the derivation. The result is a decomposition theorem having cut elimination and interpolation as corollaries.
TitelJoint Meeting of the Twenty-Third EACSL Annual Conference on Computer Science Logic (CSL) and the Twenty-Ninth Annual ACM/IEEE Symposium on Logic in Computer Science (LICS), CSL-LICS '14, Vienna, Austria, July 14 - 18, 2014
RedaktørerThomas A. Henzinger, Dale Miller
Antal sider10
ForlagAssociation for Computing Machinery
Publikationsdato12 sep. 2014
ISBN (Trykt)978-1-4503-2886-9
StatusUdgivet - 12 sep. 2014


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