rfl
α : Type u
inst✝¹ : Category α
β : Type v
inst✝ : Category β
F : α ⥤ β
as₁ as₂ bs₁ bs₂ : List α
gs : as₂ ⟶ bs₂
⊢ Prefunctor.map (Prefunctor.obj mapF.toPrefunctor F).toPrefunctor (DVect2.nil ++ gs) =
    Prefunctor.map (Prefunctor.obj mapF.toPrefunctor F).toPrefunctor DVect2.nil ++
      Prefunctor.map (Prefunctor.obj mapF.toPrefunctor F).toPrefunctor gs
no goals