Rank and -nullity of contact manifolds.
Rukimbira, Philippe (2004)
International Journal of Mathematics and Mathematical Sciences
Similarity:
Rukimbira, Philippe (2004)
International Journal of Mathematics and Mathematical Sciences
Similarity:
Xu, Xufeng, Chao, Xiaoli (1998)
International Journal of Mathematics and Mathematical Sciences
Similarity:
Absos Ali Shaikh, Shyamal Kumar Hui (2011)
Publications de l'Institut Mathématique
Similarity:
Fabio Giannoni, Antonio Masiello (1995)
Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni
Similarity:
In this Note, by using a generalization of the classical Fermat principle, we prove the existence and multiplicity of lightlike geodesics joining a point with a timelike curve on a class of Lorentzian manifolds, satisfying a suitable compactness assumption, which is weaker than the globally hyperbolicity.
De, U.C., Shaikh, A.A., Biswas, Sudipta (2003)
Novi Sad Journal of Mathematics
Similarity:
Di Terlizzi, Luigia, Pastore, Anna Maria (2002)
Balkan Journal of Geometry and its Applications (BJGA)
Similarity:
Letizia Brunetti, Anna Maria Pastore (2013)
Publications de l'Institut Mathématique
Similarity:
Rezaii, M.M., Barzegari, M. (2006)
Balkan Journal of Geometry and its Applications (BJGA)
Similarity:
Bartolo, Rossella (2003)
International Journal of Mathematics and Mathematical Sciences
Similarity:
Taras Banakh, Robert Cauty (2007)
Banach Center Publications
Similarity:
We prove that a space M with Disjoint Disk Property is a Q-manifold if and only if M × X is a Q-manifold for some C-space X. This implies that the product M × I² of a space M with the disk is a Q-manifold if and only if M × X is a Q-manifold for some C-space X. The proof of these theorems exploits the homological characterization of Q-manifolds due to Daverman and Walsh, combined with the existence of G-stable points in C-spaces. To establish the existence of such points we prove (and...
Fumio Narita (1996)
Colloquium Mathematicae
Similarity:
We consider a Riemannian submersion π: M → N, where M is a CR-submanifold of a locally conformal Kaehler manifold L with the Lee form ω which is strongly non-Kaehler and N is an almost Hermitian manifold. First, we study some geometric structures of N and the relation between the holomorphic sectional curvatures of L and N. Next, we consider the leaves M of the foliation given by ω = 0 and give a necessary and sufficient condition for M to be a Sasakian manifold.