Kernels of Linear Representations of Lie Groups, Locally Compact Groups, and Pro-Lie Groups

Details Kernels of Linear Representations of Lie Groups, Locally Compact Groups, and Pro-Lie Groups Kernels of Linear Representations of Lie Groups, Locally Compact Groups, and Pro-Lie Groups

2010-12-02

arxiv.org/abs/1012.0540v1

Mathematics

Representation Theory

Scientific paper

For a topological group G the intersection KO(G) of all kernels of ordinary representations is studied. We show that KO(G) is contained in the center of G if G is a connected pro-Lie group. The class KO(C) is determined explicitly if C is the class ConnLie of connected Lie groups or the class almConnLie of almost connected Lie groups: in both cases, it consists of all compactly generated abelian Lie groups. Every compact abelian group and every connected abelian pro-Lie group occurs as KO(G) for some connected pro-Lie group G. However, the dimension of KO(G) is bounded by the cardinality of the continuum if G is locally compact and connected. Examples are given to show that KO(C) becomes complicated if C contains groups with infinitely many connected components.

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