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A Tits alternative for $\mathbb{R}$-buildings of type $\tilde{A}_2$

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arxiv 2411.04250 v1 pith:ERKU67SN submitted 2024-11-06 math.GR

Corentin Le Bars , Jean Lécureux , Jeroen Schillewaert This is my paper · ORCID
classification math.GR
keywords buildingsprovealternativeisometriesmathbbnecessarilytildetits
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abstract

Let $G$ be a group with a non-elementary action on a (not necessarily discrete) $\tilde{A}_2$-buildings. We prove that, given a random walk on $G$, isometries in $G$ are strongly regular hyperbolic with high probability. As a consequence, we prove a Tits alternative for $G$, as well as a local-to-global fixed point result. We also prove that isometries of (not necessarily complete) $\mathbb{R}$-buildings are semi-simple.

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