2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76831Paper withdrawn. (Lemma 2.1 is false.)LaTeX2e, 9 pages. Paper withdrawn. (Lemma 2.1 is false.)Algebraic GeometryAlgebraic Topology14H15; 14F17M_g is a union of g-1 affine open subsetstext