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A Higher Structure Identity Principle

Published: 08 July 2020 Publication History

Abstract

The ordinary Structure Identity Principle states that any property of set-level structures (e.g., posets, groups, rings, fields) definable in Univalent Foundations is invariant under isomorphism: more specifically, identifications of structures coincide with isomorphisms. We prove a version of this principle for a wide range of higher-categorical structures, adapting FOLDS-signatures to specify a general class of structures, and using two-level type theory to treat all categorical dimensions uniformly. As in the previously known case of 1-categories (which is an instance of our theory), the structures themselves must satisfy a local univalence principle, stating that identifications coincide with "isomorphisms" between elements of the structure. Our main technical achievement is a definition of such isomorphisms, which we call "indiscernibilities," using only the dependency structure rather than any notion of composition.

References

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Benedikt Ahrens, Krzysztof Kapulkin, and Michael Shulman. 2015. Univalent categories and the Rezk completion. Mathematical Structures in Computer Science 25, 05 (2015), 1010--1039. https://doi.org/10.1017/S0960129514000486
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Benedikt Ahrens, Paige Randall North, Michael Shulman, and Dimitris Tsementzis. 2020. A Higher Structure Identity Principle. (2020). arXiv:2004.06572
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Danil Annenkov, Paolo Capriotti, Nicolai Kraus, and Christian Sattler. 2019. Two-Level Type Theory and Applications. (2019). https://arxiv.org/abs/1705.03307v3
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Cited By

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  • (2025)The Univalence PrincipleMemoirs of the American Mathematical Society10.1090/memo/1541305:1541Online publication date: 14-Jan-2025
  • (2024)Internal and Observational Parametricity for Cubical AgdaProceedings of the ACM on Programming Languages10.1145/36328508:POPL(209-240)Online publication date: 5-Jan-2024
  • (2024)On planarity of graphs in homotopy type theoryMathematical Structures in Computer Science10.1017/S0960129524000100(1-41)Online publication date: 8-May-2024
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cover image ACM Conferences
LICS '20: Proceedings of the 35th Annual ACM/IEEE Symposium on Logic in Computer Science
July 2020
986 pages
ISBN:9781450371049
DOI:10.1145/3373718
Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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Publication History

Published: 08 July 2020

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Author Tags

  1. categories
  2. equivalence principle
  3. homotopy type theory
  4. structure identity principle
  5. univalent foundations

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LICS '20 Paper Acceptance Rate 69 of 174 submissions, 40%;
Overall Acceptance Rate 215 of 622 submissions, 35%

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Cited By

View all
  • (2025)The Univalence PrincipleMemoirs of the American Mathematical Society10.1090/memo/1541305:1541Online publication date: 14-Jan-2025
  • (2024)Internal and Observational Parametricity for Cubical AgdaProceedings of the ACM on Programming Languages10.1145/36328508:POPL(209-240)Online publication date: 5-Jan-2024
  • (2024)On planarity of graphs in homotopy type theoryMathematical Structures in Computer Science10.1017/S0960129524000100(1-41)Online publication date: 8-May-2024
  • (2024)Topological Quantum Gates in Homotopy Type TheoryCommunications in Mathematical Physics10.1007/s00220-024-05020-8405:7Online publication date: 8-Jul-2024
  • (2023)Two-level type theory and applicationsMathematical Structures in Computer Science10.1017/S0960129523000130(1-56)Online publication date: 30-May-2023
  • (2022)Bicategories in univalent foundationsMathematical Structures in Computer Science10.1017/S096012952200003231:10(1232-1269)Online publication date: 9-Mar-2022

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