fact: Definition pb_ump_2_grpds_nat_trans_pr2 : pb_ump_2_grpds_nat_trans ▹ _ = β.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.IsoCommaCategory UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Examples.Groupoids UniMath.Bicategories.Limits.Pullbacks