2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61873We establish some remarkable properties of the cohomology rings of the Hilbert schemes of n points on a projective surface X, from which one sees to what extent these cohomology rings are (in)dependent of X and n.v. 2, 19 pages, latex, title modified, streamlined first half, to appear in J. reine Angew. MathAlgebraic GeometryQuantum Algebratext