2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/115473We derive identities for general flows of Riemannian metrics that may be regarded as local mean-value, monotonicity, or Lyapunov formulae. These generalize previous work of the first author for mean curvature flow and other nonlinear diffusions. Our results apply in particular to Ricci flow, where they yield a local monotone quantity directly analogous to Perelman's reduced volume V and a local identity related to Perelman's average energy F.Differential GeometryAnalysis of PDEs53C44, 58J35, 35K55text