On pseudosymmetric para-Kählerian manifolds.
On quantizing A-bundles over Hamilton G-spaces
On quasi-Sasakian manifolds
On Ricci curvature of -totally real submanifolds in Sasakian space forms.
On Ricci -recurrent -manifolds.
On Riemannian 4-symmetric Manifolds
On Riemannian manifolds endowed with a locally conformal cosymplectic structure.
On skew 2-projectable almost complex structures on
We deal with a -tensor field on the tangent bundle preserving vertical vectors and such that is a -tensor field on , where is the canonical almost tangent structure on . A connection on is constructed by . It is shown that if is a -almost complex structure on without torsion then is a unique linear symmetric connection such that and .
On slant submanifolds of -contact metric manifolds
On Solvable Generalized Calabi-Yau Manifolds
We give an example of a compact 6-dimensional non-Kähler symplectic manifold that satisfies the Hard Lefschetz Condition. Moreover, it is showed that is a special generalized Calabi-Yau manifold.
On Some 2-Dimensional Hermitian Manifolds.
On Some 4-Dimensional Compact Einstein Almost Kähler Manifolds.
On some strictly almost analytic vector fields in tangent bundles
On some structures defined by algebraic equations
On Sp(2) and Sp(2) · Sp(1) structures in 8-dimensional vector bundles.
Let ξ be an oriented 8-dimensional vector bundle. We prove that the structure group SO(8) of ξ can be reduced to Sp(2) or Sp(2) · Sp(1) if and only if the vector bundle associated to ξ via a certain outer automorphism of the group Spin(8) has 3 linearly independent sections or contains a 3-dimensional subbundle. Necessary and sufficient conditions for the existence of an Sp(2)- structure in ξ over a closed connected spin manifold of dimension 8 are also given in terms of characteristic classes.
On submanifolds of codimension 2 immersed in a Hsu--quarternion manifold.
On the Arnold conjecture for weakly monotone symplectic manifolds.
On the automorphism group of strongly pseudoconvex domains in almost complex manifolds
In contrast with the integrable case there exist infinitely many non-integrable homogeneous almost complex manifolds which are strongly pseudoconvex at each boundary point. All such manifolds are equivalent to the Siegel half space endowed with some linear almost complex structure.We prove that there is no relatively compact strongly pseudoconvex representation of these manifolds. Finally we study the upper semi-continuity of the automorphism group of some hyperbolic strongly pseudoconvex almost...
On the Covariant Differential of an Almost Hermitian Structure.
On the existence and non-existence of closed trajectories for some Hamiltonian flows.