fact: Definition assoc (C : precategory) : ∏ (a b c d : C) (f : a --> b) (g : b --> c) (h : c --> d), f · (g · h) = (f · g) · h := pr122 C.
imports: UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.MoreFoundations.PartA UniMath.MoreFoundations.Notations