On Kähler metrics in lorentzian manifolds
On Legendre curves in -Sasakian manifolds.
On natural para-Hermitian structures on twisted products of Lie groups
This survey article presents certain results concerning natural left invariant para-Hermitian structures on twisted (especially, semidirect) products of Lie groups.
On null geodesic collineations in some Riemannian spaces
On para-Kählerian manifolds and on skew symmetric Killing vector fields carried by .
On Quarter-symmetric Metric Connections on a Hyperbolic Kaehlerian Space
On Ricci-recurrent manifolds
On Riemann and Weyl Compatible Tensors
On Sectional Curvature of Indefinite Metrics, II.
On semi-invariant submanifolds of -cosymplectic manifolds.
On some analytical manifolds of constant sectional curvature.
On some class of nearly conformally symmetric manifolds
On some class of pseudosymmetric warped products
We present curvature properties of pseudosymmetry type of some warped products of semi-Riemannian spaces of constant curvature.
On some generalisation of recurrent manifolds.
On some generalized Einstein metric conditions on hypersurfaces in semi-Riemannian space forms
Solutions of the P. J. Ryan problem as well as investigations of curvature properties of Cartan hypersurfaces and Ricci-pseudosymmetric hypersurfaces lead to curvature identities holding on every hypersurface M isometrically immersed in a semi-Riemannian space form. These identities, under some assumptions, give rises to new generalized Einstein metric conditions on M. We investigate hypersurfaces satisfying such curvature conditions.
On some types of slant curves in contact pseudo-Hermitian 3-manifolds
We study slant curves in contact Riemannian 3-manifolds with pseudo-Hermitian proper mean curvature vector field and pseudo-Hermitian harmonic mean curvature vector field for the Tanaka-Webster connection in the tangent and normal bundles, respectively. We also study slant curves of pseudo-Hermitian AW(k)-type.
On space-times with commutative parings of vector fields.
On Super Quasi Einstein Manifold
On tensor fields semiconjugated with torse-forming vector fields
The paper deals with tensor fields which are semiconjugated with torse-forming vector fields. The existence results for semitorse-forming vector fields and for convergent vector fields are proved.
On the Blaschke invariants of generalized time-like ruled surfaces.