exact this
ℕ : Type
inst✝³ : Core ℕ
inst✝² : Induction ℕ
inst✝¹ : Addition ℕ
inst✝ : Sign ℕ
order_inst : Order ℕ
n m : ℕ
x✝ : step m > n
this✝ : n < m ∨ n ≃ m
h✝ : n ≃ m
this : m ≃ n ∨ m > n
⊢ m ≃ n ∨ m > n
no goals