fact: Definition RoofHrel (x y : ob C) : hrel (Roof x y) := (λ R1 : Roof x y, λ R2 : Roof x y, RoofHrel' R1 R2).
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors