have := (IsOfFinOrder.orderOf_pos h).ne'
G : Type u_1
inst✝ : Group G
g : G
h : IsOfFinOrder g
⊢ #↑↑(Subgroup.closure {g}) = ↑(orderOf g)
G : Type u_1
inst✝ : Group G
g : G
h : IsOfFinOrder g
this : orderOf g ≠ 0
⊢ #↑↑(Subgroup.closure {g}) = ↑(orderOf g)