English
If there is no maximum element in α, then the same relation holds globally: succ(↑a) = ↑(succ(a)).
Русский
Если в α нет максимума, то для любого элемента выполняется succ(↑a) = ↑(succ(a)).
LaTeX
$$$$ \forall a:\\alpha, \\operatorname{succ}(\\iota(a)) = \\iota(\\operatorname{succ}(a)). $$$$
Lean4
@[simp]
theorem succ_coe [NoMaxOrder α] {a : α} : succ (↑a : WithTop α) = ↑(succ a) :=
succ_coe_of_not_isMax <| not_isMax a