Demonstratio Mathematica, vol.36, no.4, pp.971-984, 2003 (Journal Indexed in SCI Expanded)
© 2013 Warsaw University. All rights reserved.We consider hypersurfaces of a semi-Euclidean spaces satisfying some curvature condition of pseudosymmetry type related to solutions of the P.J. Ryan problem of the equivalence of semisymmetry and Ricci-semisymmetry on hypersurfaces.