fact: Definition quotient_poset_hrel_on_el : hrel X := λ x₁ x₂, I x₁ ∨ RX x₁ x₂.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.OrderTheory.Posets.Basics UniMath.OrderTheory.Posets.MonotoneFunctions UniMath.OrderTheory.Posets.PointedPosets