fact: Definition id2_right {a b : C} {f g : C⟦a, b⟧} (x : f ==> g) : x • id2 g = x := pr1 (pr2 (pr2 C)) _ _ _ _ x.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence