PUBLICATIONS DE L'INSTITUT MATHÉMATIQUE (BEOGRAD) (N.S.) Vol. 60(74), pp. 137142 (1996) 

Totally umbilical degenerate Monge hypersurfaces\newline of $R_1^4$Constantin C\u alinDepartment of Mathematics, Technical University, 6600 Iasi, RomaniaAbstract: We determine all the totally umbilical lightlike Monge hypersurfaces of $R^4_1$. This is done by using the BejancuDuggal method [1] of studying lightlike hypersurfaces and then integrating a system of partial differential equations. Keywords: lightlike degenerate hypersurfaces, totally umbilical, screen distribution, lightlike transversal vector bundle Classification (MSC2000): 53C40; 53C55 Full text of the article:
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