induction as
α : Type u
inst✝ : Category α
as : List α
⊢ mapF.unitorLax as ≫ mapF.unitorOplax as = 𝟙 as
case nil
α : Type u
inst✝ : Category α
⊢ mapF.unitorLax [] ≫ mapF.unitorOplax [] = 𝟙 []

case cons
α : Type u
inst✝ : Category α
head✝ : α
tail✝ : List α
tail_ih✝ : mapF.unitorLax tail✝ ≫ mapF.unitorOplax tail✝ = 𝟙 tail✝
⊢ mapF.unitorLax (head✝ :: tail✝) ≫ mapF.unitorOplax (head✝ :: tail✝) = 𝟙 (head✝ :: tail✝)