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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_06_11_dvorak_hu_sereni: Theorem 2 of Dvořák, Hu and Sereni (Advances in Combinatorics 2019) gives a graph that is 4-choosable but not (8,2)-choosable, a counterexample at m = 2; accepted on the refereed publication and the site's credit.