Results 31 to 40 of about 374,684 (258)

On nonexistence of Kenmotsu structure on аст-hypersurfaces of cosymplectic type of a Kählerian manifold

Дифференциальная геометрия многообразий фигур, 2019
Almost contact metric (аст-)structures induced on oriented hypersur­fa­ces of a Kählerian manifold are considered in the case when these аст-struc­tures are of cosymplectic type, i. e. the contact form of these struc­tu­res is closed. As it is known, the
G. Banaru
doaj   +1 more source

Reduction of Homogeneous Pseudo-Kähler Structures by One-Dimensional Fibers

Axioms, 2020
We study the reduction procedure applied to pseudo-Kähler manifolds by a one dimensional Lie group acting by isometries and preserving the complex tensor. We endow the quotient manifold with an almost contact metric structure. We use this fact to connect
José Luis Carmona Jiménez, Marco Castrillón López   +1 more
doaj   +1 more source

On the Classifying of the Tangent Sphere Bundle with Almost Contact B-Metric Structure

پژوهش‌های ریاضی, 2021
One of the classical fundamental motifs in differential geometry of manifolds is the notion of the almost contact structure. As a counterpart of the almost contact metric structure, the notion of the almost contact B-metric structure has been an ...
Esmaeil Peyghan, Farshad Firuzi
doaj  

On the existence of almost contact structure and the contact magnetic field [PDF]

Acta Mathematica Hungarica, 2009
Junta de ...
Cabrerizo Jaraíz, José Luis, Fernández Andrés, Manuel, Gómez Casanueva, Juan Salvador   +2 more
openaire   +4 more sources

A Note on Coeffective 1–Differentiable Cohomology

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2014
After a brief review of some basic notions concerning 1-differentiable cohomology, named here ď-cohomology, we introduce a Lichnerowicz ď– cohomology in a classical way.
Ida Cristian, Mercheşan Sabinşan
doaj   +1 more source

A note about almost contact metric hypersurfaces axioms for almost Hermitian manifolds

Дифференциальная геометрия многообразий фигур
From 1950s, it is known that an almost contact metric structure is in­duced on an arbitrary oriented hypersurface in an almost Hermitian mani­fold. In accordance with the definition, an almost Hermitian manifold satisfies the axiom of almost contact ...
A. Abu-Saleem, M. B. Banaru, G. A. Banaru   +2 more
doaj   +1 more source

Contact-Complex Riemannian Submersions

Mathematics, 2021
A submersion from an almost contact Riemannian manifold to an almost Hermitian manifold, acting on the horizontal distribution by preserving both the metric and the structure, is, roughly speaking a contact-complex Riemannian submersion. This paper deals
Cornelia-Livia Bejan, Şemsi Eken Meriç, Erol Kılıç   +2 more
doaj   +1 more source

$K$-contact generalized square Finsler manifolds [PDF]

AUT Journal of Mathematics and Computing
We study almost contact generalized square Finsler manifolds and introduce the notion of $K$-contact Finsler structures. Then, we characterize generalized square $K$-contact almost contact manifolds.
Hannaneh Faraji, Behzad Najafi Saghezchi, Tayebeh Tabatabaeifar   +2 more
doaj   +1 more source

Invariant almost contact structure on the real extension of a sphere

Учёные записки Казанского университета: Серия Физико-математические науки
The existence of contact and almost contact metric structures invariant under the group of motions on the real extension of a two-dimensional sphere with a Riemannian direct product metric was examined.
M. V. Sorokina, Y. V. Morshchinkina
doaj   +1 more source

Hyperbolic normal almost contactmetric hypersurfaces in Euclidean 4-dimensional space

Lietuvos Matematikos Rinkinys, 2005
In Euclidean 4-dimensional space, all hyper surfaces with normal almost contact metric structure of hyperbolic type as well as hyperbolic Sasakian structure are found.
Angelė Baškienė
doaj   +3 more sources