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erdos_1102.upper_density_Q

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Every sequence with property Q has upper density at most `6 / π^2`.

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Lean 4 Statement 
theorem erdos_1102.upper_density_Q
    (A : ℕ → ℕ) (h_inc : StrictMono A)
    (hQ : HasPropertyQ (range A)) :
    limsup (fun j : ℕ  ↦ (j / A j : ℝ)) atTop ≤ 6 / Real.pi^2
ID: ErdosProblems__1102__erdos_1102.upper_density_Q
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