dsimp
α : Type u
inst✝ : Category α
bs : List α
a : α
as : List α
h_ind : 𝟙 as ++ 𝟙 bs = 𝟙 (as ++ bs)
⊢ 𝟙 (a :: as) ++ 𝟙 bs = 𝟙 (a :: as ++ bs)
α : Type u
inst✝ : Category α
bs : List α
a : α
as : List α
h_ind : 𝟙 as ++ 𝟙 bs = 𝟙 (as ++ bs)
⊢ DVect2.cons (𝟙 a) (𝟙 as) ++ 𝟙 bs = DVect2.cons (𝟙 a) (𝟙 (as ++ bs))