have : ord_sgn (compare n m) ≃ ord_sgn Ordering.gt := this
ℕ : Type
inst✝ : Natural ℕ
n m : ℕ
x✝ : (n——m).sgn ≃ 1
this : ord_sgn (compare n m) ≃ 1
⊢ Positive (n——m)
ℕ : Type
inst✝ : Natural ℕ
n m : ℕ
x✝ : (n——m).sgn ≃ 1
this✝ : ord_sgn (compare n m) ≃ 1
this : ord_sgn (compare n m) ≃ ord_sgn Ordering.gt
⊢ Positive (n——m)