Özet:
In the present paper our aim is to investigate lightlike hypersurfaces of R-1(4) having degenerate or non-degenerate planar normal sections. Firstly, we prove that lightlike hypersurfaces in R-1(4) always have degenerate planar normal sections. Then we examine the conditions for lightlike hypersurfaces in R-1(4) to have non-degenerate planar normal sections and obtain some characterizations for such lightlike hypersurfaces.
