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A system of interaction and structure V: the exponentials and splitting

Published online by Cambridge University Press:  30 March 2011

ALESSIO GUGLIELMI and
LUTZ STRAßBURGER
ALESSIO GUGLIELMI
Affiliation:
Department of Computer Science, University of Bath, Bath BA2 7AY, United Kingdom Email: alessio@guglielmi.name
LUTZ STRAßBURGER
Affiliation:
INRIA Saclay–Île-de-France and École Polytechnique, Laboratoire d'Informatique (LIX), Rue de Saclay, 91128 Palaiseau Cedex, France Email: lutz@lix.polytechnique.fr
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Abstract

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System NEL is the mixed commutative/non-commutative linear logic BV augmented with linear logic's exponentials, or, equivalently, it is MELL augmented with the non-commutative self-dual connective seq. NEL is presented in deep inference, because no Gentzen formalism can express it in such a way that the cut rule is admissible. Other recent work shows that system NEL is Turing-complete, and is able to express process algebra sequential composition directly and model causal quantum evolution faithfully. In this paper, we show cut elimination for NEL, based on a technique that we call splitting. The splitting theorem shows how and to what extent we can recover a sequent-like structure in NEL proofs. When combined with a ‘decomposition’ theorem, proved in the previous paper of this series, splitting yields a cut-elimination procedure for NEL.

Information

Type
Paper
Information
Mathematical Structures in Computer Science , Volume 21 , Issue 3 , June 2011, pp. 563 - 584
Copyright
Copyright © Cambridge University Press 2011

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