fact: Definition RoofEqclassIn {x y : ob C} (RE : RoofEqclass x y) : hsubtype (Roof x y) := pr1 RE.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors