Linear logic without boxes

Abstract
J.-Y. Girard's original definition of proof nets for linear logic involves boxes. The box is the unit for erasing and duplicating fragments of proof nets. It imposes synchronization, limits sharing, and impedes a completely local view of computation. The authors describe an implementation of proof nets without boxes. Proof nets are translated into graphs of the sort used in optimal λ-calculus implementations; computation is performed by simple graph rewriting. This graph implementation helps in understanding optimal reductions in the λ-calculus and in the various programming languages inspired by linear logic

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