2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/119793We have shown that Lorentz transformation is not necessary to present relativistic relative velocity. A modified definition of velocity together with Galilean transformation is equivalent to relativistic relative velocity. On the other hand, Galilean relative velocity can be presented as a Lorentz transformation. Again the definition of velocity requires a modification.4 pagesMathematical Physicstext