fact: Definition inv_of_invertible_2cell {C : bicat} {X Y : C} {f g : X --> Y} : invertible_2cell f g → invertible_2cell g f.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors UniMath.Bicategories.Core.Bicat