2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59462Homomorphisms on quandle cohomology groups that raise the dimensions by one are studied in relation to the cocycle state-sum invariants of knots and knotted surfaces. Skein relations are also studied.14 pages; 6 Figures. Minor corrections: The main application of one proposition remains true, but the proposition has been downgraded to a conjectureGeometric Topology57M25; 57M45text