2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161260We give a metric characterization of the Euclidean sphere in terms of the lower bound of the sectional curvature and the length of the shortest closed geodesics.20 pagesDifferential Geometry53C20, 53C22The length of the shortest closed geodesics on a positively curved manifoldtext