Results 31 to 40 of about 3,067,810 (315)
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
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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 +1 more
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Almost contact metric structures induced by $G_2$ structures
TURKISH JOURNAL OF MATHEMATICS, 2017 We study almost contact metric structures induced by 2-fold vector cross products on manifolds with $G_2$ structures. We get some results on possible classes of almost contact metric structures. Finally we give examples.
Ozdemir, Nulifer +2 more
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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
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From Dual Connections to Almost Contact Structures
Mathematics, 2022 A dualistic structure on a smooth Riemaniann manifold M is a triple (M,g,∇) with g a Riemaniann metric and ∇ an affine connection generally assumed to be torsionless. From g and ∇, dual connection ∇* can be defined.
Emmanuel Gnandi, Stéphane Puechmorel
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Open books on contact five-manifolds [PDF]
, 2006 The aim of this paper is to give an alternative proof of a theorem about the existence of contact structures on five-manifolds due to Geiges. This theorem asserts that simply-connected five-manifolds admit a contact structure in every homotopy class of ...
van Koert, Otto
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ON ALMOST r-CONTACT STRUCTURE MANIFOLDS
Demonstratio Mathematica, 1988 Let \((M^{2n+r},g)\) be a \((2n+r)\)-dimensional Riemannian \(C^{\infty}\)- manifold with metric tensor g. If \(M^{2n+r}\) carries a tensor field F of type (1,1) and r linearly independent vector fields \(U_ s\) and 1- forms \(u_ s\) \((s=1,...,r)\) such that \(F^ 2=-Id+\sum_{s}U_ s\otimes u_ s,\) \(F(U_ s)=0\), \(u_ s\circ F=0\), \(g(FX,FY)=g(X,Y ...
Nivas, Ram, Singh, Rajesh
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ALMOST PARA-r CONTACT STRUCTURE MANIFOLD
Demonstratio Mathematica, 1986 All basic definitions and results of this paper have been introduced and studied in a number of papers [e.g. the reviewer and \textit{A. Miernowski}, Ann. Univ. Mariae Curie-Sklodowska, Sect. A 39 (1985); Acta Math. Hung. 45, 327-336 (1985; Zbl 0574.53025), the reviewer, Tensor, New Ser.
Gupta, V. C., Prasad, C. S.
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On almost contact affine $3$-structures
Kodai Mathematical Journal, 1973 Summary:
Yano, Kentaro +2 more
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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
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