Half-lightlike submanifolds with planar normal sections in R4 2

Half-lightlike submanifolds with planar normal sections in R4 2

We investigate half-lightlike submanifolds with planar normal sections of 4-dimensional pseudo-Euclidean space. We obtain necessary and sufficient conditions for a half-lightlike submanifold of R 4 2 such that it has degenerate or nondegenerate planar normal sections.

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