2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61598The group of bordism classes of unoriented surfaces in 4-space is determined. The bordism classes are characterized by normal Euler numbers,double linking numbers, and triple linking numbers.17 pages, 17 Figures. epsf.sty embedded in Tex FileGeometric TopologyAlgebraic Topology57Q45text