Results 261 to 270 of about 14,606,458 (293)

On the existence of generalized complex space forms

Israel Journal of Mathematics, 1989
Let \((M,g,J)\) be an almost Hermitian manifold such that its Riemannian curvature tensor has the expression \(R=f\pi_ 1+h\pi_ 2\) where \(f,h\in C^{\infty}\) and \[ \pi_ 1(X,Y)Z = g(X,Z)Y-g(Y,Z)X, \] \[ \pi_ 2(X,Y)Z = g(JX,Z)JY-g(JY,Z)JX+2g(JX,Y)JZ \] for arbitrary vector fields \(X\), \(Y\), \(Z\).
Zbigniew Olszak
exaly   +2 more sources

On a Lorentzian Complex Space Form

National Academy Science Letters, 2020
The aim of the present paper is to study the theory of general relativity in a Lorentzian Kahler space. In this paper, we have considered the Lorentzian complex space form with constant sectional curvature and proved that a Lorentzian complex space form satisfying Einstein’s field equation is a Ricci semi-symmetric space and the energy–momentum tensor ...
Pankaj Pandey, B. B. Chaturvedi
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Lagrangian Bonnet Problems in Complex Space Forms

Acta Mathematica Sinica, English Series, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
He, Huixia, Ma, Hui, Wang, Erxiao
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The BDD space complexity of different forms of concurrency

Proceedings Second International Conference on Application of Concurrency to System Design, 2002
Summary: The automated verification of concurrent systems by model checking is often confronted with the state space explosion problem. A widely adopted method to tackle this problem is to use Binary Decision Diagrams (BDDs) for representing systems and state spaces implicitly.
Michael Baldamus, Klaus Schneider 0001
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Certain submanifolds of complex space forms

São Paulo Journal of Mathematical Sciences, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Mirjana Djorić, Masafumi Okumura
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On real hypersurfaces in a complex space form

Mathematical Journal of Okayama University, 1998
Let \(M(c)\) be a Kähler manifold of non-vanishing constant holomorphic sectional curvature \(c\) and with real dimension \(2n\geq 6\). Furthermore, let \(P\) be a real hypersurface, \(N\) a local unit normal vector field and \(R\) the Riemann curvature tensor of \(P\).
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Isotropic Immersions with Low Codimension of Complex Space Forms into Real Space Forms

Canadian Mathematical Bulletin, 2004
AbstractThe main purpose of this paper is to determine isotropic immersions of complex space forms into real space forms with low codimension. This is an improvement of a result of S. Maeda.
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Complex submanifolds of indefinite complex space forms

Proceedings of the American Mathematical Society
In this short paper, we derive a new result on Umehara algebra. As a consequence, we prove that an indefinite complex hyperbolic space and an indefinite complex projective space do not share a common complex submanifold with induced metrics, answering a question raised in Cheng et al.
Cheng, Xiaoliang, Hao, Yihong, Yuan, Yuan, Zhang, Xu   +3 more
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Families of differential forms on complex spaces

2003
Summary: On every reduced complex space \(X\) we construct a family of complexes of soft sheaves \(\Omega_X\); each of them is a resolution of the constant sheaf \(\mathbb{C}_X\) and induces the ordinary De Rham complex of differential forms on a dense open analytic subset of \(X\). The construction is functorial (in a suitable sense). Moreover each of
ANCONA, VINCENZO, B. GAVEAU
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Symplectic reflections and complex space forms

Annals of Global Analysis and Geometry, 1991
Let (M,g,J) be a Hermitian manifold and N a submanifold of M. Then the reflection about N is called a symplectic reflection if it preserves the Kaehler form of (M,g,J). In this paper the authors prove the following Theorem. Let (M,g,J) be a Hermitian space of complex dimension \(n\geq 2\).
Chen, Bang-Yen, Vanhecke, Lieven
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