fact: Definition Monic_comp {x y z : C} (M1 : Monic x y) (M2 : Monic y z) : Monic x z := tpair _ (M1 · M2) (isMonic_comp M1 M2 (pr2 M1) (pr2 M2)).
imports: UniMath.Foundations.PartD UniMath.Foundations.Propositions UniMath.Foundations.Sets UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.Core.NaturalTransformations UniMath.CategoryTheory.FunctorCategory UniMath.CategoryTheory.Subcategory.Core UniMath.CategoryTheory.Core.Functors