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:
影响因子:
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通讯作者:
Dave Witte
中科院分区:
文献类型:
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作者:
Dave Witte
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.