2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98498We prove a purity theorem for abelian schemes in arbitrary unramified mixed characteristic (0,p). The case p=2 is completely new and the case p>2 fixes several errors in the literature.11 pagesNumber Theory11G10, 11G18, 11G25, 11G35, 14F30, 14G35, 14K10text