2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148224A new topological invariant of closed connected orientable four-dimensional manifolds is proposed. The invariant, constructed via surgery on a special link, is a four-dimensional counterpart of the celebrated SU(2) three-manifold invariant of Reshetikhin, Turaev and Witten.8 pages, plaintex, Revised version (MARCH 1993): trivial factorization escapedHigh Energy Physics - TheoryAlgebraic GeometryQuantum Algebratext