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arXiv 1105.4969math.GR
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幂零群幂群的双态自相似作用

Finite-state self-similar actions of nilpotent groups

Ievgen Bondarenko, Rostyslav Kravchenko

摘要:

设$G$是一个无挠生成的幂零群,$ϕ:H\rightarrow G$是有限指标子群$H<G$的满同态,其核为平凡$ϕ$ -核.对于$G$中的$H$的陪集代表的每一个选择,存在与$(G,ϕ)$相关联的群$G$的忠实自相似作用。我们感兴趣的是,在什么情况下,所有这些行动是有限状态,并在什么情况下,存在一个有限状态自相似作用的$(G,ϕ)$。这两个性质的特征在于在约旦标准形的相应的自同构$\widehatϕ$的李代数的Mal'cev完成$G$。

英文摘要:

Let $G$ be a finitely generated torsion-free nilpotent group and $ϕ:H\rightarrow G$ be a surjective homomorphism from a subgroup $H<G$ of finite index with trivial $ϕ$-core. For every choice of coset representatives of $H$ in $G$ there is a faithful self-similar action of the group $G$ associated with $(G,ϕ)$. We are interested in what cases all these actions are finite-state and in what cases there exists a finite-state self-similar action for $(G,ϕ)$. These two properties are characterized in terms of the Jordan normal form of the corresponding automorphism $\widehatϕ$ of the Lie algebra of the Mal'cev completion of $G$.

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