2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147081This replacement corrects statement and proof of the main result. Also, a section on the universal Abel-Jacobi map has been added.13 pages in AMS-TeX v2.1Algebraic GeometryStable cohomology of the mapping class group with symplectic coefficients and of the universal Abel-Jacobi maptext