Aubrey D.N.J. de Grey’s Breakthrough

In 68 years of the problem’s life, many fine mathematicians obtained many beautiful results in special circumstances. However, no progress occurred in the general case until Aubrey de Grey (Ph.D. in Biology, University of Cambridge) succeeded in a joint effort of his imagination and a clever computer program he wrote for this purpose. On January 16, 2018, de Grey sent me the first version, followed by a corrected one [G1] on April 7, 2018, with the following introductory note: