Lemma isaprop_has_homsets (C : precategory_ob_mor) : isaprop (has_homsets C). Proof. do 2 (apply impred; intro). apply isapropisaset. Qed.
Require Import UniMath.Foundations.Propositions. Require Import UniMath.Foundations.Sets. Require Import UniMath.MoreFoundations.PartA. Require Import UniMath.MoreFoundations.Notations.