2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87160I give here: i) a very simple proof that the physical non-existence of gravitational waves (GW's) is quite consistent with the basic principles of general relativity (GR); ii) a new argument against the physical existence of GW's; iii) a criticism of Fock's treatment of the GW's; iv) some remarks on recent experimental investigations concerning the GW's.5 pages, LaTex, to be published on Spacetime & SubstanceGeneral Physicstext