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Wadler introduced Classical Processes (CP), a calculus based on a propositions-as-types correspondence between propositions of classical linear logic and session types. Carbone et al. introduced Multiparty Classical Processes, a calculus that generalises CP to multiparty session types, by replacing the duality of classical linear logic (relating two types) with a more general notion of coherence (relating an arbitrary number of types). This paper introduces variants of CP and MCP, plus a new intermediate calculus of Globally-governed Classical Processes (GCP). We show a tight relation between these three calculi, giving semantics-preserving translations from GCP to CP and from MCP to GCP. The translation from GCP to CP interprets a coherence proof as an arbiter process that mediates communications in a session, while MCP adds annotations that permit processes to communicate directly without centralised control.
@InProceedings{carbone_et_al:LIPIcs.CONCUR.2016.33,
author = {Carbone, Marco and Lindley, Sam and Montesi, Fabrizio and Sch\"{u}rmann, Carsten and Wadler, Philip},
title = {{Coherence Generalises Duality: A Logical Explanation of Multiparty Session Types}},
booktitle = {27th International Conference on Concurrency Theory (CONCUR 2016)},
pages = {33:1--33:15},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-017-0},
ISSN = {1868-8969},
year = {2016},
volume = {59},
editor = {Desharnais, Jos\'{e}e and Jagadeesan, Radha},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2016.33},
URN = {urn:nbn:de:0030-drops-61811},
doi = {10.4230/LIPIcs.CONCUR.2016.33},
annote = {Keywords: Multiparty Session Types, Linear Logic, Propositions as Types}
}