2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58560We find new obstructions to the existence of complete Riemannian metric of nonnegative sectional curvature on manifolds with infinite fundamental groups. In particular, we construct many examples of vector bundles whose total spaces admit no nonnegatively curved metric.25 pagesDifferential GeometryGeometric Topology53C20text