2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/101042The Cauchy problem for a coupled system of the Schroedinger and the KdV equation is shown to be globally well-posed for data with infinite energy. The proof uses refined bilinear Strichartz estimates and the I-method introduced by Colliander, Keel, Staffilani, Takaoka, and Tao.25 pages. Minor corrections have been madeAnalysis of PDEs35Q53, 35Q55text