2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106356In this paper we give new methods to construct zero divisors in A_n =R^(2^n) the Cayley_Dickson algebras over the real numbers, for n larger than 4, and we also relate the set of zero divisors in A_{n+1} with the Stiefel Manifold V_{2^n -1,2} for n>3. We also introduce the notion of "Spectrum" (of a no zero double pure element) wich synthesize the information regarding the structure of the linear operators left and right multiplication by the element. We use this as a main technical tool to construct the zero divisors.28 pages,submmited to Boletin de la Sociedad Matematica MexicanaRings and AlgebrasAlgebraic Topology17A99text