fact: Definition iso_to_natTrans {F G : functor C D } (phi : natIso F G) : natTrans F G := mkNatTrans _ _ phi (@ni_natural _ _ _ _ phi).
imports: Coq(ssreflect ssrfun) Coq.Relations(Relation_Definitions) Coq.Classes(RelationClasses Morphisms) Mon(SPropBase)