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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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1981_01_01_furstenberg: Furstenberg's 1981 book gives an infinite set whose difference set is not a set of 2-recurrence, so for every m a dense set has no three-term progression with difference in B-B for some m-element B; no for every k, curator credit.
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