fact: Definition faithful_1cell_eq_cell {B : bicat} {a b : B} {f : a --> b} (Hf : faithful_1cell f) {z : B} {g₁ g₂ : z --> a} {α₁ α₂ : g₁ ==> g₂} (p : α₁ ▹ f = α₂ ▹ f) : α₁ = α₂ := Hf _ _ _ _ _ p.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Core.Isos UniMath.Bicategories.Core.Bicat UniMath.Bicategories.Core.Invertible_2cells