intro n (_ : Positive (step n))
ℕ : Type
inst✝³ : Core ℕ
inst✝² : Induction ℕ
inst✝¹ : Addition ℕ
inst✝ : Sign ℕ
n : ℕ
⊢ ∀ (m : ℕ), Positive (step m) → ∃ m_1, step m_1 ≃ step m
ℕ : Type
inst✝³ : Core ℕ
inst✝² : Induction ℕ
inst✝¹ : Addition ℕ
inst✝ : Sign ℕ
n✝ n : ℕ
x✝ : Positive (step n)
⊢ ∃ m, step m ≃ step n