Commensurators of normal subgroups of lattices
arxiv(2022)
摘要
We study a question of Shalom concerning arithmeticity of discrete subgroups of semisimple Lie groups with dense commensurators. We answer Shalom's question positively for normal subgroups of lattices. This generalizes a result of the second author and T. Koberda.
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关键词
normal subgroups,commensurators
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