2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86298The notion of gravitational wave (GW) came forth originally as a by-product of the linear approximation of general relativity (GR). Now, it can be proved that this approximation is quite inadequate to a proper study of the hypothetic GW's. The significant role of the approximations beyond the linear stage is emphasized.7 pages, LaTeX, to be published on Spacetime & SubstanceGeneral Physicstext