2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226316A sufficient condition for an orthogonally transitive G2 cylindrical spacetime to be singularity-free is shown. The condition is general enough to comprise all known geodesically complete perfect fluid cosmologies.2 pp. ws-p9-75x6-50.clsGeneral Relativity and Quantum Cosmologytext