fact: Definition RoofEqClassIn2 {x y : ob C} (RE : RoofEqclass x y) (R2 R3 : Roof x y) (H1 : RoofEqclassIn RE R2) (H2 : (make_eqrel _ (RoofEqrel x y)) R2 R3) : RoofEqclassIn RE R3.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors