Compact Connected Lie Transformation Groups On Spheres With Low Cohomogeneity Ii
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Compact Connected Lie Transformation Groups on Spheres with Low Cohomogeneity. II
Author: Eldar Straume
language: en
Publisher: American Mathematical Soc.
Release Date: 1997
The cohomogeneity of a transformation group ([italic capitals]G, X) is, by definition, the dimension of its orbit space, [italic]c = dim [italic capitals]X, G. We are concerned with the classification of differentiable compact connected Lie transformation groups on (homology) spheres, with [italic]c [less than or equal to symbol] 2, and the main results are summarized in five theorems, A, B, C, D, and E in part I. This paper is part II of the project, and addresses theorems D and E. D examines the orthogonal model from theorem A and orbit structures, while theorem E addresses the existence of "exotic" [italic capital]G-spheres.
Compact Connected Lie Transformation Groups on Spheres with Low Cohomogeneity, I
Author: Eldar Straume
language: en
Publisher: American Mathematical Soc.
Release Date: 1996
The cohomogeneity of a transformation group ([italic capitals]G, X) is, by definition, the dimension of its orbit space, [italic]c = dim [italic capitals]X, G. By enlarging this simple numerical invariant, but suitably restricted, one gradually increases the complexity of orbit structures of transformation groups. This is a natural program for classical space forms, which traditionally constitute the first canonical family of testing spaces, due to their unique combination of topological simplicity and abundance in varieties of compact differentiable transformation groups.
Abelian Galois Cohomology of Reductive Groups
Author: Mikhail Borovoi
language: en
Publisher: American Mathematical Soc.
Release Date: 1998
In this volume, a new function H 2/ab (K, G) of abelian Galois cohomology is introduced from the category of connected reductive groups G over a field K of characteristic 0 to the category of abelian groups. The abelian Galois cohomology and the abelianization map ab1: H1 (K, G) -- H 2/ab (K, G) are used to give a functorial, almost explicit description of the usual Galois cohomology set H1 (K, G) when K is a number field