fact: Definition RoofEqclassIs {x y : ob C} (RE : RoofEqclass x y) : iseqclass (make_eqrel _ (RoofEqrel x y)) (RoofEqclassIn RE) := pr2 RE.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors