2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147109The authors learnt that similar results have been independently found by D.Zagier, V.Baranovsky and V.Balaji/A.King/P.Newstead. The corresponding references have been added (and some typos corrected).15 pages, LatexAlgebraic GeometryRecursive relations for the cohomology ring of moduli spaces of stable bundlestext