2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87425In this paper we present a pedestrian review of the theoretical fact that all relativistic wave equations possess solutions of arbitrary velocities $0 \leq v < \infty$. We discuss some experimental evidences of $v \geq c$ transmission of electromagnetic field configurations and the importance of these facts with regard to the principle of relativity.12 pages, Latex2e article, with figures. Requires packages epsfig and graphicx. Figure 2 has been correctedPopular PhysicsClassical PhysicsHistory and Philosophy of Physicstext