Browsing 2015 by MSC "20"

Now showing items 1-2 of 2

Cocharacter-closure and spherical buildings

[OWP-2015-12] Bate, Michael; Herpel, Sebastian; Martin, Benjamin; Röhrle, Gerhard (Mathematisches Forschungsinstitut Oberwolfach, 2015-07-29)

Let $k$ be a field, let $G$ be a reductive $k$ -group and $V$ an affine $k$ -variety on which $G$ acts. In this note we continue our study of the notion of cocharacter-closed $G(k)$ -orbits in $V$ . In earlier work we used a ...
Torsion-free Covers of Solvable Minimax Groups

[OWP-2015-15] Kropholler, Peter H.; Lorensen, Karl (Mathematisches Forschungsinstitut Oberwolfach, 2015-11-18)

We prove that every finitely generated solvable minimax group can be realized as a quotient of a torsion-free solvable minimax group. This result has an application to the investigation of random walks on finitely generated ...