On the semisimple degree of symmetry
On the stratification of the orbit space for the action of automorphisms on connections [Book]
On the Symmetries of the Fake C P2.
On the topological classification of pseudofree group actions on 4-manifolds. I.
On the topology of spherically symmetric space-times
Spherically symmetric space-times have attained considerable attention ever since the early beginnings of the theory of general relativity. In fact, they have appeared already in the papers of K. Schwarzschild [12] and W. De Sitter [5] which were published in 1916 and 1917 respectively soon after Einstein's epoch-making work [7] in 1915. The present survey is concerned mainly with recent results pertainig to the toplogy of spherically symmetric space-times. Definition. By space-time a connected...
On the uniform perfectness of groups of bundle homeomorphisms
Groups of homeomorphisms related to locally trivial bundles are studied. It is shown that these groups are perfect. Moreover if the homeomorphism isotopy group of the base is bounded then the bundle homeomorphism group of the total space is uniformly perfect.
On the Uniqueness of Some Affinely Flat Infra-nilmanifolds.
On the winding number and equivariant homotopy classes of maps of manifolds with some finite group actions
One fixed point actions on low-dimensional spheres.
Operators on differential forms for Lie transformation groups.
Orbifold-Uniformizing Differential Equations.
Orbifold-Uniformizing Differential Equations. III. Arrangements Defined by 3-Dimensional Primitive Unitary Reflection Groups.
Orbit projections as fibrations
The orbit projection of a proper -manifold is a fibration if and only if all points in are regular. Under additional assumptions we show that is a quasifibration if and only if all points are regular. We get a full answer in the equivariant category: is a -quasifibration if and only if all points are regular.
Orbit spaces of the hyperspace of a graph which are Hilbert cubes
Orbit Structure of certain -actions on solid torus
In this paper we describe the orbit structure of -actions of on the solid torus having and as the only compact orbits, and as singular set.
Orientation Reversing Involutions and the First Betti Number for Finite Coverings of 3-Manifolds.
Outer automorphism groups of Bieberbach groups.