A locally compact group acting faithfully on a manifold must be Lie. Hilbert's fifth problem, one level up — settled for Lipschitz and 3D actions, open in general.
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 lie-theory — 1 entry. Clear