fact: Definition idto2mor_lwhisker {x y z : C} (f : x --> y) {g h : y --> z} (p : g = h) : f ◃ idto2mor p = idto2mor (maponpaths (λ q, f · q) p).
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence