2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228685In this talk we would like to review recent results on non-singular cosmological models. It has been recently shown that among stiff perfect fluid inhomogeneous spacetimes the absence of singularities is more common than it was expected in the literature. We would like to generalize these results and apply them to other matter sources.6 pp. Proceedings of ERE'04; Published in Beyond General Relativity. Proceedings of the 2004 Spanish Relativity Meeting (ERE2004). Eds: N. Alonso-Alberca, E. Alvarez, T. Ortin, (ed.), M.A. Vazquez-Mozo. Universidad Autonoma de Madrid, Madrid, 2007General Relativity and Quantum Cosmologytext