2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/128644Let R be a commutative, noetherian, local ring. Topological Q-vector spaces modelled on full subcategories of the derived category of R are constructed in order to study intersection multiplicities.Commutative Algebra13A35, 13D22, 13H15, 14F17text