,
Federico Olimpieri
Creative Commons Attribution 3.0 Unported license
Non-idempotent intersection types can be seen as a syntactic presentation of a well-known denotational semantics for the lambda-calculus, the category of sets and relations. Building on previous work, we present a categorification of this line of thought in the framework of the bang calculus, an untyped version of Levy’s call-by-push-value. We define a bicategorical model for the bang calculus, whose syntactic counterpart is a suitable category of types. In the framework of distributors, we introduce intersection type distributors, a bicategorical proof relevant refinement of relational semantics. Finally, we prove that intersection type distributors characterize normalization at depth 0.
@InProceedings{guerrieri_et_al:LIPIcs.CSL.2021.25,
author = {Guerrieri, Giulio and Olimpieri, Federico},
title = {{Categorifying Non-Idempotent Intersection Types}},
booktitle = {29th EACSL Annual Conference on Computer Science Logic (CSL 2021)},
pages = {25:1--25:24},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-175-7},
ISSN = {1868-8969},
year = {2021},
volume = {183},
editor = {Baier, Christel and Goubault-Larrecq, Jean},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CSL.2021.25},
URN = {urn:nbn:de:0030-drops-134592},
doi = {10.4230/LIPIcs.CSL.2021.25},
annote = {Keywords: Linear logic, bang calculus, non-idempotent intersection types, distributors, relational semantics, combinatorial species, symmetric sequences, bicategory, categorification}
}