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arXiv · 2509.05054

Non-residually finite $\tilde{C}_2$-lattices

Thomas Titz Mite·Stefan Witzel
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Abstract

We provide the first known examples of non-residually finite lattices on irreducible buildings. They contain the first known simple CAT(0)-groups with property (T), and the first known CAT(0)-groups that are not quasi-isometric to a direct product. We also classify type-preserving vertex-regular lattices on buildings of type $\tilde{A}_2$ and thickness three, and discover an arithmetic example that is not commensurable to previously studied lattices.

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Thomas Titz Mite, Stefan Witzel. 2025-09-05. Non-residually finite $\tilde{C}_2$-lattices. https://arxiv.org/abs/2509.05054

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