本文在前几篇论文的基础上，就欧氏空间中心Ｇｒａｍ行列式的性质在闵氏空间中做了相应讨论。......

给出了闵氏空间的一些性质，讨论了闵氏空间Ｓｍｉｔｈ正交化及直和问题。...

We study totally umbilical screen transversal lightlike submanifolds immersed in a semi-Riemannian product manifold and ......

In this paper, we consider Osserman conditions on lightlike warped product (sub-)manifolds with respect to the Jacobi Op......

Lightlike warped product manifolds are considered in this paper. The geometry of lightlike submanifolds is difficult to ......