2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117580We prove strong cosmic censorship for T^2-symmetric cosmological spacetimes (with spatial topology T^3 and vanishing cosmological constant Lambda) with collisionless matter. Gowdy symmetric spacetimes constitute a special case. The formulation of the conjecture is in terms of generic C^2-inextendibility of the metric. Our argument exploits a rigidity property of Cauchy horizons, inherited from Killing fields.17 pages, no figuresGeneral Relativity and Quantum Cosmologytext