Superrigid Subgroups and Syndetic Hulls in Solvable Lie Groups

Superrigid Subgroups and Syndetic Hulls in Solvable Lie Groups
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可解李群中的超刚性子群和联合壳

DOI:
10.1007/978-3-662-04743-9_24
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发表时间:
2001
期刊:
arXiv: Representation Theory
影响因子:
--
通讯作者:
Dave Witte
Dave Witte
中科院分区:
--
文献类型:
--
作者:
Dave Witte

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不难看出,每个群同态都可以扩展为一个群同态。我们讨论了连通李群G的离散子群Γ的其它例子,使得定义在Γ上的同态可以(“虚拟地”)推广到定义在G的全体上的同态.对于G是可解的情形,我们给出了一个简单的证明:若G是Zebraki稠密的,则G是可解的.关键的因素是联合外壳的存在。
It is not difficult to see that every group homomorphism from ℤkto ℝnextends to a homomorphism from ℝkto ℝn. We discuss other examples of discrete subgroups Γ of connected Lie groupsG, such that the homomorphisms defined on Γ can (“virtually”) be extended to homomorphisms defined on all ofG. For the case whereGis solvable, we give a simple proof that Γ has this property if it is Zariski dense. The key ingredient is a result on the existence of syndetic hulls.