exact this
ℕ : Type
inst✝ : Natural ℕ
n m : ℕ
x✝ : (n——m).sgn ≃ 0
this✝³ : ord_sgn (compare n m) ≃ 0
this✝² : ord_sgn (compare n m) ≃ ord_sgn Ordering.eq
this✝¹ : compare n m = Ordering.eq
this✝ : n ≃ m
this : n——m ≃ 0
⊢ n——m ≃ 0
no goals