fact: Definition Compose_IsFunctor `(HF : EndoFunctor F) `(HG : EndoFunctor G) : IsFunctor (@Compose_Functor _ HF _ HG) := ToAFunctor (Compose (FromAFunctor HF) (FromAFunctor HG)).
imports: Category.Lib Category.Theory.Category Category.Theory.Functor Category.Instance.Coq Category.Theory.Coq.Functor