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kruckeberg_1961

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Krückeberg ([Kr61]) exhibited an infinite Sidon set `A` with `sidonUpperDensity A = 1 / Real.sqrt 2`, improving Erdős’ earlier `1 / 2` lower bound. [Kr61] Krückeberg, Fritz, $B\sb{2}$-Folgen und verwandte Zahlenfolgen. J. Reine Angew. Math. (1961), 53-60.

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Lean 4 Statement 
theorem kruckeberg_1961 : ∃ (A : Set ℕ), IsSidon A ∧
    sidonUpperDensity A = 1 / Real.sqrt 2
ID: ErdosProblems__329__kruckeberg_1961
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