proposition: Corollary compose_fmap `{Functor F} `{Functor G} {x y} (f : x → y) : fmap[F ∘ G]%prg f = fmap[F] (fmap[G] f).
proof: Proof. reflexivity. Qed.
imports: Category.Lib Category.Theory.Category Category.Theory.Functor Category.Instance.Coq Category.Theory.Coq.Functor