fact: Definition InvRoofFromMorInSom {x y : C} (s : y --> x) (S : SOM y x s) : Roof x y.
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.Functors