2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150768Einstein rejected the differential law of energy-momentum conservation $ T^{μν}_{;ν} = 0 $. In doing so, he violated the principle of general covariance. Here, we prove the conservation law $ T^{μν}_{;ν} = 0 $ and discuss its significance for general relativity.4 pages, LaTeX; some rewordingGeneral Physicstext