Lightlike Hypersurfaces of a Semi-Riemannian Product Manifold and Quarter-Symmetric Nonmetric Connections

الملخص EN

We study lightlike hypersurfaces of a semi-Riemannian product manifold.

We introduce a class of lightlike hypersurfaces called screen semi-invariant lightlike hypersurfaces and radical anti-invariant lightlike hypersurfaces.

We consider lightlike hypersurfaces with respect to a quarter-symmetric nonmetric connection which is determined by the product structure.

We give some equivalent conditions for integrability of distributions with respect to the Levi-Civita connection of semi-Riemannian manifolds and the quarter-symmetric nonmetric connection, and we obtain some results.