2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/111388The well-known problem of classical mechanics considered by Bertrand (1857) and Darboux (1901) is reviewed in the context of Cartan's geometry.20 pages, 4 figures (in total 5 files)Mathematical PhysicsAstrophysicsDifferential GeometryHistory and OverviewExactly Solvable and Integrable Systems37J35, 53C05text