Definition idtomor {C : precategory_data} (a b : C) (H : a = b) : a --> b. Proof. induction H. exact (identity a). Defined.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Notations.