Matter field space times admitting symmetry mappings satisfying vanishing contraction of the Lie deformation of the Ricci tensor
Metric of special 2F-flat Riemannian spaces
In this paper we find the metric in an explicit shape of special -flat Riemannian spaces , i.e. spaces, which are -planar mapped on flat spaces. In this case it is supposed, that is the cubic structure: .
Minimal lightlike hypersurfaces in with integrable screen distribution.
Minkowski asymptotic spaces in general relativity
Minkowski minimal surfaces in with minimal focal surfaces.