Stratified coherent spaces: a denotational semantics for Light Linear Logic

Abstract

Light linear logic (LLL) was introduced by Girard as a logical system capturing the class of polytime function within the proofs-as-programs approach. This paper deals with the denotational semantics of LLL: we introduce a variant of coherent spaces and prove that it is a sound model for this system, but not for usual linear logic. A simpler version of the model yields a sound semantics of Elementary linear logic, which is the analog of LLL for the class of Kalmar elementary functions.