Now showing items 1-5 of 5
Isotropic submanifolds of pseudo-Riemannian spaces [Article]
The family of all the submanifolds of a given Riemannian or pseudo-Riemannian manifold is large enough to classify them into some interesting subfamilies such as minimal (maximal), totally geodesic, Einstein, etc. Most of ...
The contact number of a pseudo-Euclidean submanifold [Article]
(Mathematical Society of the Republic of China, 2008-10)
In this paper we define the contact number of a pseudo-Riemannian submanifold into the pseudo-Euclidean space, and prove that this contact number is closely related to the notion of pseudo-isotropic submanifold. We give ...
Nullification functors and the homotopy type of the classifying space for proper bundles [Article]
(Mathematical Sciences Publishers, 2005-09)
Let G be a discrete group for which the classifying space for proper G-actions is finite-dimensional. We find a space W such that for any such G, the classifying space BG for proper G-bundles has the homotopy type of the ...
Nullification and cellularization of classifying spaces of finite groups [Article]
(American Mathematical Society, 2007-04)
In this note we discuss the effect of the BZ/p-nullification PBZ/p and the BZ/p-cellularization CWBZ/p over classifying spaces of finite groups, and we relate them with the corresponding functors with respect to Moore ...
Minimal covers of open manifolds with half-spaces and the proper L-S category of product spaces [Article]
(Belgian Mathematical Society, 2002-09)
Classical results about the Lusternik-Schnirelmann category of product spaces have their analogues in the category of proper maps. By comparing the proper Lusternik-Schnirelmann category of an open manifold X with ...