Exact van der Waerden numbers: how long an interval forces a monochromatic k-term progression? Only scattered values known; W(2,7) already open.
The Problems
Not schoolwork — the questions that resisted Erdős, Hilbert, and everyone since. The club keeps three shelves: what is still open, what AI recently settled, and what took humanity centuries.
Tagged ramsey-theory — 1 entry. Clear