Lemma REL_precategory_has_homsets : has_homsets REL_precategory. Proof. exact (λ _ _, isaset_set_fun_space (pr1 _) (_ ,, isaset_set_fun_space _ (_ ,, isasethProp))). Qed.
Require Import UniMath.Foundations.All. Require Import UniMath.MoreFoundations.All. Require Import UniMath.CategoryTheory.Core.Categories. Require Import UniMath.CategoryTheory.Core.Isos. Require Import UniMath.CategoryTheory.Core.Univalence. Require Import UniMath.CategoryTheory.Categories.HSET.All.