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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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sha256:70a3c31228c207db4923ccf85485d5598c9c261ead5a433bb3538a882f1ebb1c
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sha256:b21a65ed6d300a8b758f2f37f90c08f1dd60e132f5e8e9ecf4369d43e87986e6
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sha256:8c823d621b7e1256c8e47c60a5f1c54c016a5507e6f27b2bab537f6f5f232067
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sha256:c9d14c459c518937e758918b5897dc3b22f1a55f07739afe99502f5b046c907a
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2415f78e850aeee50afdca525c6f2e0ea606f207

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