Generic warped product submanifolds in nearly Kähler manifolds.
Man untersucht die gegenseitige Lage der Geodätischen und der Gegennormalschnitte in Punkten und zwar auch im Fall, dass die Geodätische von Punkt in einer Hauptkrümmungsrichtung ausgeht.
Man untersucht die Limesbeziehungen der Winkel zwischen der Geodätischen und den Gegennormalschnitten in Punkten und für auch in den Fällen, dass die Geodätische von Punkt in einer Hauptkrümmungsrichtung ausgeht oder dass ein Nabelpunkt ist.
The concept of geodesic graph is generalized from Riemannian geometry to Finsler geometry, in particular to homogeneous Randers g.o. manifolds. On modified H-type groups which admit a Riemannian g.o. metric, invariant Randers g.o. metrics are determined and geodesic graphs in these Finsler g.o. manifolds are constructed. New structures of geodesic graphs are observed.
In ( Dušek, Z., Kowalski, O. and Nikčević, S. Ž., New examples of Riemannian g.o. manifolds in dimension 7, Differential Geom. Appl. 21 (2004), 65–78.), the present authors and S. Nikčević constructed the 2-parameter family of invariant Riemannian metrics on the homogeneous manifolds and . They proved that, for the open dense subset of this family, the corresponding Riemannian manifolds are g.o. manifolds which are not naturally reductive. Now we are going to investigate the remaining metrics...
In the present paper a generalized Kählerian space of the first kind is considered as a generalized Riemannian space with almost complex structure that is covariantly constant with respect to the first kind of covariant derivative. Using a non-symmetric metric tensor we find necessary and sufficient conditions for geodesic mappings with respect to the four kinds of covariant derivatives. These conditions have the form of a closed system of partial differential equations in covariant derivatives...