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e study a new class of lightlike submanifolds M, called warped product lightlike submanifolds, of a semi-Riemann manifold. We show that the null geometry of M reduces to the corresponding non-degenerate geometry of its semi-Riemann submanifold. 2000 Mathematics Subject Classification. 53C15, 53C40, 53C50
Bayram Şahin (Wed,) studied this question.
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