News

HaJeMaDre Algebra-Seminar

In a few weeks on 13 July, we will participate in the
 HaJeMaDre Algebra-Seminar,
the joint algebra seminar of the universities of Halle, Jena, Magdeburg and Dresden.

See you there!

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Tee-Seminar WWU Münster

On Tuesday 22 June, Yuri will talk about 
 "Recognizing graphs in three-space"
at the Tee-Seminar der AG Kramer in the WWU Münster.
See you there!

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Actions of locally compact groups

The paper "Abstract group actions of locally compact groups on CAT(0) spaces" by Philip Möller and Olga Varghese will be published on the journal Groups, Geometry and Dynamics!

Link to the paper: preprint version

Abstract:
We study abstract group actions of locally compact Hausdorff groups on CAT(0) spaces. Under mild assumptions on the action we show that it is continuous or has a global fixed point. This mirrors results by Dudley and Morris-Nickolas for actions on trees. As a consequence we obtain a geometric proof for the fact that any abstract group homomorphism from a locally compact Hausdorff group into a torsion free CAT(0) group is continuous.

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Last Modification: 21.05.2021 - Contact Person: P. Schwer