fact: Definition has_pb_ump_1 {p : pb_cone} (H : has_pb_ump p) : pb_ump_1 p := pr1 H.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Univalence