2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59648Let X be a smooth closed oriented non-spin 4-manifold with even intersection form kE_8\oplus nH. In this article we show that n\geq |k| on X. Thus we confirm the 10/8-conjecture affirmatively. As an application, we also give an estimate of intersection forms of spin coverings of non-spin 4-manifolds with even intersection forms.11 pages. The proof has been replaced, due to an errorDifferential Geometry57R55text