2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74758In this article, we consider alternating knots on a closed surface in the 3-sphere, and show that these are not parallel to any closed surface disjoint from the prescribed one.8 pages, 4 figuresGeometric TopologyPrimary 57M25, 57M35; Secondary 57Q35, 57Q37text