2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77146Let (M,g) be a compact oriented Einstein 4-manifold. If M has positive intersection form and g has non-negative sectional curvature, we show that, up to rescaling and isometry, (M,g) is CP2, equipped with its standard Fubini-Study metric.14 pages, LaTeX2eDifferential Geometry53C21text