2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228049We establish a relationship between the graded quotients of a filtered holonomic D-module, their sheaf-theoretic duals, and the characteristic variety, in case the filtered D-module underlies a polarized Hodge module on a smooth algebraic variety. The proof is based on Saito's result that the associated graded module is Cohen-Macaulay, and on local duality on the cotangent bundle.16 pagesAlgebraic Geometry32C38, 14D07, 14B15text