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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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2025_10_20_girao: Girão's observation, recorded in the site's commentary, that a uniformly random coloring gives R(n;3,2) exponential in n, so the bound C(r)^{sqrt n} of Problem 129 is false as written; pending, with no independent review.
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