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Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.
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2018_03_01_moreira_richter_robertson: Theorem 1.2 of Moreira, Richter and Robertson (Ann. of Math. 2019) gives, in every set of natural numbers of positive upper density, a sumset B + C with B and C infinite; credited by the site's curator and refereed.
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