2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59650We decompose the Marsden-Weinstein reductions for the moment map associated to representations of a quiver. The decomposition involves symmetric products of deformations of Kleinian singularities, as well as other terms. As a corollary we deduce that the Marsden-Weinstein reductions are irreducible varieties.12 pages; correction: the arguments do not prove reducedness of the schemesAlgebraic Geometry16G20 (Primary) 53D20 (Secondary)text