2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169794In [10], R. Hamilton established a differential Harnack inequality for solutions to the Ricci flow with nonnegative curvature operator. We show that this inequality holds under the weaker condition that M x R^2 has nonnegative isotropic curvature.revised version, to appear in J. Diff. GeomDifferential GeometryAnalysis of PDEsA generalization of Hamilton's differential Harnack inequality for the Ricci flowtext