have : Positive n := lt_zero_pos.mpr this
ℕ : Type
inst✝³ : Core ℕ
inst✝² : Induction ℕ
inst✝¹ : Addition ℕ
inst✝ : Sign ℕ
order_inst : Order ℕ
n : ℕ
x✝ : n ≥ 1
this✝ : n ≥ step 0
this : n > 0
⊢ Positive n
ℕ : Type
inst✝³ : Core ℕ
inst✝² : Induction ℕ
inst✝¹ : Addition ℕ
inst✝ : Sign ℕ
order_inst : Order ℕ
n : ℕ
x✝ : n ≥ 1
this✝¹ : n ≥ step 0
this✝ : n > 0
this : Positive n
⊢ Positive n