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Erdős problem 245

Let ANA\subseteq\mathbb{N} be an infinite set such that A{1,...,N}=o(N)|A\cap \{1, ..., N\}| = o(N). Is it true that lim supN(A+A){1,...,N}A{1,...,N}3? \limsup_{N\to\infty}\frac{|(A + A)\cap \{1, ..., N\}|}{|A \cap \{1, ..., N\}|} \geq 3?

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FormalConjectures/ErdosProblems/245.lean

Formal Conjectures

FormalConjectures/ErdosProblems/245.leanErdos245.erdos_2455 linesExact file
True  ∀ (A : Set ℕ),    A.Infinite      Filter.Tendsto (fun N => ↑(ASet.Icc 1 ⌊N⌋₊).ncard / N) Filter.atTop (nhds 0) →        3 ≤ Filter.limsup (fun N => ↑((A + A) ∩ Set.Icc 1 ⌊N⌋₊).ncard / ↑(ASet.Icc 1 ⌊N⌋₊).ncard) Filter.atTop
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