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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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2026_03_07_van_doorn_li_tang: Theorem 2.1 of van Doorn, Li and Tang (arXiv, 2026): the least number of distinct multiples of distinct members of an m-set in an interval of twice the largest member is min(m, ceiling of 2 root m); site-accepted preprint.