fact: Definition all_is_invertible_is_is_invertible_2cell {F G : ps_base} {η ε : F --> G} (α : η ==> ε) : (∏ (X : C), is_invertible_2cell (α X)) ≃ is_invertible_2cell α.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.PrecategoryBinProduct UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Morphisms.Adjunctions UniMath.Bicategories.Core.Invertible_2cells UniMath.Bicategories.Core.Univalence UniMath.Bicategories.Core.AdjointUnique