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erdos_757.upperBound

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In [GyLe95], the authors also prove that the supremum is smaller than `3 / 5`.

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Lean 4 Statement 
theorem erdos_757.upperBound {A : Set ℝ} : sSup {c | IsAdmissible c} < 3 / (5 : ℝ)
ID: ErdosProblems__757__erdos_757.upperBound
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