2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61088The relationship between ${\cal D}$-modules and free divisors has been studied in a general setting by L. Narváez and F.J. Calderón. Using the ideas of these works we prove in this article a duality formula between two ${\cal D}$-modules associated to a class of free divisors on ${\bf C}^n$ and we give some applicationsAlgebraic GeometryCommutative Algebra32C38; 13N10; 14F40; 13P10text