Polymath16, first thread: Simplifying de Grey’s graph

Given the initial activity on the Polymath proposal page, Terry Tao suggested that Aubrey de Grey and I launch Polymath16 to make progress on the Hadwiger–Nelson problem. This project is a follow-up to Aubrey’s breakthrough result that the chromatic number of the plane is at least 5. Discussion of the project of a non-research nature … Continue reading Polymath16, first thread: Simplifying de Grey’s graph