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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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1991_09_01_erdos_hajnal_tuza: Erdős, Hajnal and Tuza bound the best t between floor(3r/16 + 7/8) and ceil(r/5), which determines t = ceil(r/5) for the 38 values of r from 3 to 70 where the two bounds meet; refereed.
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