2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226165We prove that the cohomology groups with rational coefficients of the Voronoi compactification of the moduli space of abelian threefolds coincide with the Chow groups of that space, as determined by Van der Geer.15 pages; exposition improved, first sections expanded, last section slightly shortenedAlgebraic Geometry14K10 (Primary), 14C15, 14F25, 14D22 (Secondary)text