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.
You are welcome to use PayPal to start or renew your subscription for volume XXVIII. The subscription form appears on page 71 of the printed issue. We are keeping the rates low and unchanged. I welcome your submissions of essays posing open problems, formulating conjectures, and presenting solutions of problems that have appeared here. Please, submit pdf file to email@example.com in the digital format described in the menu item “Submission Formatting with a hand–signed copyright form (e-mail it as a jpeg attachment, or mail it) found at Geombinatorics Web Site http://www.uccs.edu/~geombina/ .
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