2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61651Using a characterization of parabolics in reductive Lie groups due to Furstenberg, elementary properties of buildings, and some algebraic topology, we give a new proof of Tits' classification of 2-transitive Lie groups.To appear in: Journal Reine Angew. MathematikDifferential GeometryGroup Theory53C; 22Ftext