2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59519The forbidden moves can be combined with Gauss diagram Reidemeister moves to obtain move sequences with which we may change any Gauss diagram (and hence any virtual knot) into any other, including in particular the unknotted diagram5 pages; see http://www.math.lsu.edu/~nelson for a higher resolution version and more about virtual knotsGeometric Topology57M25text