2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/163024It is understood now that all projective (and conformal) invariants of Riemannian metrics can be found by a transparent construction based on representation theory. So this article with a partial and quite cumbersome construction of projective invariants become obsolete.The paper is withdrawn by the authorDifferential Geometrytext