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Autre Publication Scientifique Année : 2006

Deriving SN from PSN: a general proof technique

Résumé

In the framework of explicit substitutions there is two termination properties: preservation of strong normalization (PSN), and strong normalization (SN). Since there are not easily proved, only one of them is usually established (and sometimes none). We propose here a connection between them which helps to get SN when one already has PSN. For this purpose, we formalize a general proof technique of SN which consists in expanding substitutions into "pure" lambda-terms and to inherit SN of the whole calculus by SN of the "pure" calculus and by PSN. We apply it successfully to a large set of calculi with explicit substitutions, allowing us to establish SN, or, at least, to trace back the failure of SN to that of PSN.

Dates et versions

hal-00420464 , version 1 (29-09-2009)

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Citer

Emmanuel Polonowski. Deriving SN from PSN: a general proof technique. 2006. ⟨hal-00420464⟩

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