rw [ite_id]
case neg
s : SelbergSieve
k n : ℕ
f : ℕ → ℝ
h : ∀ (l : ℕ), l ∣ n → ¬k ∣ l → f l = 0
hn : ¬n = 0
hkn : k ∣ n
l : ℕ
hl : l ∈ n.divisors
hkl : ¬k ∣ l
m : ℕ
a✝ : m ∈ n.divisors
⊢ (if l = k * m then 0 else 0) = 0
no goals