Type Theory with Explicit Universe Polymorphism

Marc Bezem; Thierry Coquand; Peter Dybjer; Martín Escardó

doi:10.4230/LIPIcs.TYPES.2022.13

Type Theory with Explicit Universe Polymorphism

Marc Bezem, Thierry Coquand, Peter Dybjer, Martín Escardó

Computer Science

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Abstract

The aim of this paper is to refine and extend proposals by Sozeau and Tabareau and by Voevodsky for universe polymorphism in type theory. In those systems judgments can depend on explicit constraints between universe levels. We here present a system where we also have products indexed by universe levels and by constraints. Our theory has judgments for internal universe levels, built up from level variables by a successor operation and a binary supremum operation, and also judgments for equality of universe levels.

Original language	English
Title of host publication	28th International Conference on Types for Proofs and Programs, TYPES 2022
Editors	Delia Kesner, Pierre-Marie Pedrot
Publisher	Schloss Dagstuhl
Pages	13:1-13:16
ISBN (Electronic)	9783959772853
DOIs	https://doi.org/10.4230/LIPIcs.TYPES.2022.13
Publication status	Published - 27 Jul 2023
Event	28th International Conference on Types for Proofs and Programs, TYPES 2022 - Nantes, France Duration: 20 Jun 2022 → 25 Jun 2022

Publication series

Name	Leibniz International Proceedings in Informatics, LIPIcs
Volume	269
ISSN (Print)	1868-8969

Conference

Conference	28th International Conference on Types for Proofs and Programs, TYPES 2022
Country/Territory	France
City	Nantes
Period	20/06/22 → 25/06/22

Bibliographical note

Funding Information:
Acknowledgements The authors are grateful to the anonymous referees for useful feedback, and to Matthieu Sozeau for an update on the current state of universe polymorphism in Coq. We acknowledge the support of the Centre for Advanced Study (CAS) at the Norwegian Academy of Science and Letters in Oslo, Norway, which funded and hosted the research project Homotopy Type Theory and Univalent Foundations during the academic year 2018/19.

Publisher Copyright:
© Marc Bezem, Thierry Coquand, Peter Dybjer, and Martín Escardó.

Keywords

constraint-indexed products
level-indexed products
type theory
universe polymorphism
universes in type theory

ASJC Scopus subject areas

Software

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10.4230/LIPIcs.TYPES.2022.13Licence: Creative Commons: Attribution (CC BY)

BezemM2022TypeFinal published version, 758 KBLicence: Creative Commons: Attribution (CC BY)

Cite this

Bezem, M., Coquand, T., Dybjer, P., & Escardó, M. (2023). Type Theory with Explicit Universe Polymorphism. In D. Kesner, & P.-M. Pedrot (Eds.), 28th International Conference on Types for Proofs and Programs, TYPES 2022 (pp. 13:1-13:16). Article 13 (Leibniz International Proceedings in Informatics, LIPIcs; Vol. 269). Schloss Dagstuhl. https://doi.org/10.4230/LIPIcs.TYPES.2022.13

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abstract = "The aim of this paper is to refine and extend proposals by Sozeau and Tabareau and by Voevodsky for universe polymorphism in type theory. In those systems judgments can depend on explicit constraints between universe levels. We here present a system where we also have products indexed by universe levels and by constraints. Our theory has judgments for internal universe levels, built up from level variables by a successor operation and a binary supremum operation, and also judgments for equality of universe levels.",

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author = "Marc Bezem and Thierry Coquand and Peter Dybjer and Mart{\'i}n Escard{\'o}",

note = "Funding Information: Acknowledgements The authors are grateful to the anonymous referees for useful feedback, and to Matthieu Sozeau for an update on the current state of universe polymorphism in Coq. We acknowledge the support of the Centre for Advanced Study (CAS) at the Norwegian Academy of Science and Letters in Oslo, Norway, which funded and hosted the research project Homotopy Type Theory and Univalent Foundations during the academic year 2018/19. Publisher Copyright: {\textcopyright} Marc Bezem, Thierry Coquand, Peter Dybjer, and Mart{\'i}n Escard{\'o}.; 28th International Conference on Types for Proofs and Programs, TYPES 2022 ; Conference date: 20-06-2022 Through 25-06-2022",

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Bezem, M, Coquand, T, Dybjer, P & Escardó, M 2023, Type Theory with Explicit Universe Polymorphism. in D Kesner & P-M Pedrot (eds), 28th International Conference on Types for Proofs and Programs, TYPES 2022., 13, Leibniz International Proceedings in Informatics, LIPIcs, vol. 269, Schloss Dagstuhl, pp. 13:1-13:16, 28th International Conference on Types for Proofs and Programs, TYPES 2022, Nantes, France, 20/06/22. https://doi.org/10.4230/LIPIcs.TYPES.2022.13

Type Theory with Explicit Universe Polymorphism. / Bezem, Marc; Coquand, Thierry; Dybjer, Peter et al.
28th International Conference on Types for Proofs and Programs, TYPES 2022. ed. / Delia Kesner; Pierre-Marie Pedrot. Schloss Dagstuhl, 2023. p. 13:1-13:16 13 (Leibniz International Proceedings in Informatics, LIPIcs; Vol. 269).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - The aim of this paper is to refine and extend proposals by Sozeau and Tabareau and by Voevodsky for universe polymorphism in type theory. In those systems judgments can depend on explicit constraints between universe levels. We here present a system where we also have products indexed by universe levels and by constraints. Our theory has judgments for internal universe levels, built up from level variables by a successor operation and a binary supremum operation, and also judgments for equality of universe levels.

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Type Theory with Explicit Universe Polymorphism

Abstract

Publication series

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Bibliographical note

Keywords

ASJC Scopus subject areas

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