With this Special Issue, Geombinatorics commences the 28th year of its existence. It includes pioneering essays by Aubrey D.N.J. de Grey, who constructs the first ever 5-chromatic unit-distance graph; Marijn J.H. Heule, who sets 6 consecutive world records in reducing the size of such graphs; and Geoffrey Exoo and Dan Ismailescu, who are arming themselves – and us – with tools for the next big step.
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