2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97772The harmonicity condition of the curvature 2-form of a pseudo- Riemannian manifold is formulated on the basis of annulment of this form by the de Rham-Lichnerowicz Laplacian. The following theorem is proved: The curvature 2-form of any Einstein manifold is harmonic.4 pagesGeneral Relativity and Quantum Cosmologytext