2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147150I have just replaced the first line by %&amslplain in order to be compiled by AMS-LaTeX.AMS-LaTeX v. 1.1, 16 pagesAlgebraic GeometryHeisenberg algebra and Hilbert schemes of points on projective surfacestext