2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/33994We answer the following question: Let l, m, n be arbitrary real numbers. Does there exist a 3-dimensional homogeneous Riemannian manifold whose eigenvalues of the Ricci tensor are just l, m and n ?2 pages, LaTeX, reprinted from Proc. Conf. Brno (1995)General Relativity and Quantum Cosmologytext