Problem
erdos:520True ↔ ∃ c > 0, ∀ (Ω : Type) [inst : MeasureTheory.MeasureSpace Ω] [MeasureTheory.IsProbabilityMeasure MeasureTheory.volume] (f : ℕ → Ω → ℝ), Erdos520.IsRademacherMultiplicative f → ∀ᵐ (ω : Ω), Filter.limsup (fun N => ∑ m ∈ Finset.Iic N, f m ω / √(↑N * Real.log (Real.log ↑N))) Filter.atTop = c
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