2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/241We extend some results on even sets of nodes which have been proved for surfaces up to degree 6 to surfaces up to degree 10. In particular, we give a formula for the minimal cardinality of a nonempty even set of nodes.LaTeX 2e, 17 pagesAlgebraic Geometrytext