Bicategories in univalent foundations

Benedikt Ahrens, Dan Frumin, Marco Maggesi, Niccolò Veltri, Niels van der Weide

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We develop bicategory theory in univalent foundations. Guided by the notion of univalence for (1-)categories studied by Ahrens, Kapulkin, and Shulman, we define and study univalent bicategories. To construct examples of univalent bicategories in a modular fashion, we develop displayed bicategories, an analog of displayed 1-categories introduced by Ahrens and Lumsdaine. We demonstrate the applicability of this notion and prove that several bicategories of interest are univalent. Among these are the bicategory of univalent categories with families and the bicategory of pseudofunctors between univalent bicategories. Furthermore, we show that every bicategory with univalent hom-categories is weakly equivalent to a univalent bicategory. All of our work is formalized in Coq as part of the UniMath library of univalent mathematics.
Original languageEnglish
Pages (from-to)1-38
Number of pages38
JournalMathematical Structures in Computer Science
Publication statusPublished - 2022


  • Bicategory theory
  • univalent mathematics
  • dependent type theory
  • Coq


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