False ↔ ∀ (C : ℝ), 0 < C → have f := fun x => match x with | (k, l) => 2 ^ k * 3 ^ l; {x | ∃ B, ∃ (h : B.Nonempty) (_ : ↑(B.sup f) ≤ C * ↑(B.inf' h f)), ∑ x ∈ B, f x = x}.HasDensity 0