J. Gómez

CORRIGENDUM: CODIMENSION-TWO SPACELIKE SUBMANIFOLDS WITH UMBILICAL LIGHTLIKE NORMAL SECTIONS AND THEIR RELATIONSHIP TO LIGHTLIKE

This corrigendum corrects an error in the proof of Theorem 6.20 of the original article. Property (P), used to propagate umbilicity from the initial spacelike submanifold to the lightlike hypersurface generated by the normal exponential map, is false, and an explicit counterexample shows that the corresponding implic...