2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48407A short review is given of some theoretical approaches to CPT violation. A potentially realistic possibility is that small apparent breaking of CPT and Lorentz symmetry could arise at the level of the standard model from spontaneous symmetry breaking in an underlying theory. Some experimental constraints are described.13 pages, talk presented at WEIN '98, Santa Fe, New Mexico, June 1998High Energy Physics - Phenomenologytext