2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/229604This paper has been withdrawn by the author. The statement of the Main Theorem but is wrong in general, there have been provided counterexamples. The main theorem only holds conditionally, under the finiteness statement of theorem 2.8.16 pages, added some referencesNumber Theory11G10, 14G25text