Definition id_left (C : precategory) : ∏ (a b : C) (f : a --> b), identity a · f = f := pr112 C.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Notations.