rfl
α : Type u
inst✝ : Category α
a : α
as : List α
h_ind : joinF.unitorLeftOplax as ≫ joinF.unitorLeftLax as = 𝟙 (Prefunctor.obj (singletonF ⋙ joinF).toPrefunctor as)
⊢ DVect2.cons (𝟙 a) (𝟙 (Prefunctor.obj (singletonF ⋙ joinF).toPrefunctor as)) =
    𝟙 (Prefunctor.obj joinF.toPrefunctor (Prefunctor.obj singletonF.toPrefunctor (a :: as)))
no goals