The Classification of ...-symmetric Sasakian Manifolds.
O. Kowalski, J.A. Jiménez (1993)
Monatshefte für Mathematik
Michael Heller, Wiesław Sasin (1997)
Banach Center Publications
The most elegant definition of singularities in general relativity as b-boundary points, when applied to the closed Friedman world model, leads to the disastrous situation: both the initial and final singularities form the single point of the b-boundary which is not Hausdorff separated from the rest of space-time. We apply Alain Connes' method of non-commutative geometry, defined in terms of a C*-algebra, to this case. It turns out that both the initial and final singularities can be analysed as...
Grigorios Tsagas (1972)
Mathematische Annalen
Antonio Cassa (1990)
Rendiconti del Seminario Matematico della Università di Padova
Vanžura, Jiří (1999)
Proceedings of the 18th Winter School "Geometry and Physics"
Michor, Peter W. (1987)
Proceedings of the 14th Winter School on Abstract Analysis
Peter Buser (1978)
Manuscripta mathematica
Heinz, Günter (2000)
Beiträge zur Algebra und Geometrie
Păun, Marius (2002)
Balkan Journal of Geometry and its Applications (BJGA)
Frank Morgan (1991)
Mathematische Annalen
Mileva Prvanović (2013)
Communications in Mathematics
By using the technique of decomposition of a Hermitian vector space under the action of a unitary group, Ganchev [2] obtained a tensor which he named the Weyl component of the antiholomorphic curvature tensor. We show that the same tensor can be obtained by direct application of the conformal change of the metric to the antiholomorphic curvature tensor. Also, we find some other conformally curvature tensors and examine some relations between them.
Bumagin, Inna (2004)
Algebraic & Geometric Topology
S. J. Aldersley, G. W. Horndeski, G. Mess (1984)
L. Zhiyong Gao (1985)
Mathematische Annalen
Su-shing Chen, Anthony Manning (1981)
Mathematische Zeitschrift
Suhyoung Choi (1999)
Mémoires de la Société Mathématique de France
Elisabeth Werner, Carsten Schütt (1990)
Mathematica Scandinavica
Najoua Gamara (2001)
Journal of the European Mathematical Society
Let be a compact CR manifold of dimension with a contact form , and its associated CR conformal laplacien. The CR Yamabe conjecture states that there is a contact form on conformal to which has a constant Webster curvature. This problem is equivalent to the existence of a function such that , on . D. Jerison and J. M. Lee solved the CR Yamabe problem in the case where and is not locally CR equivalent to the sphere of . In a join work with R. Yacoub, the CR Yamabe problem...
Francesco Mercuri (1977)
Mathematische Zeitschrift
Chen, Bang-yen, Kuan, Wei-Eihn (1994)
Beiträge zur Algebra und Geometrie