2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165235Let H be a finite dimensional semisimple Hopf algebra over an algebraically closed field of characteristic zero. In this note we give a short proof of the fact that a Hopf subalgebra of H is a depth two subalgebra if and only if it is normal Hopf subalgebra.5 pagesRings and Algebras16W30text