Definition assoc' (C : precategory) : ∏ (a b c d : C) (f : a --> b) (g : b --> c) (h : c --> d), (f · g) · h = f · (g · h) := pr222 C.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Notations.