match this with
| Or.inl (_ : m < n) =>
  have : n > m := ‹m < n›
  exact Or.inl this
| Or.inr (_ : m ≃ n) =>
  have : n ≃ m := Rel.symm ‹m ≃ n›
  exact Or.inr 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✝ : n ≥ m
this✝ : m ≤ n
this : m < n ∨ m ≃ n
⊢ n > m ∨ n ≃ m
no goals