proposition: Lemma Rezk_initial_functor_from : is_initial_functor_from A (tpair _ (Rezk_completion A) (Rezk_eta A)).
proof: Proof. intro D. destruct D as [D F]. set (T:= Rezk_eta_Universal_Property D (pr2 D)). apply T. Defined.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Univalence UniMath.CategoryTheory.Core.Functors UniMath.CategoryTheory.Categories.HSET.Core UniMath.CategoryTheory.Categories.HSET.Univalence UniMath.CategoryTheory.opp_precat UniMath.CategoryTheory.yoneda UniMath.CategoryTheory.Subcategory.Core UniMath.CategoryTheory.Subcategory.Full UniMath.CategoryTheory.Equivalences.Core UniMath.CategoryTheory.whiskering UniMath.CategoryTheory.precomp_fully_faithful UniMath.CategoryTheory.precomp_ess_surj