2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223565On the space of homomorphisms from a Verma module to an indecomposable tilting module of the BGG-category O we define a natural filtration following Andersen and establish a formula expressing the dimensions of the filtration steps in terms of coefficients of Kazhdan-Lusztig polynomials.English version of math.RT/0604589, v3 revised translationRepresentation Theory22E47text