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arXiv 1801.04595math.GR
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某些分形群中的Engel元

Engel elements in some fractal groups

Gustavo A. Fernández-Alcober, Albert Garreta, Marialaura Noce

摘要:

设$p$是素数,并且设$G$是$p$ -进树的自同构群的Sylow pro- $p$子群的子群。证明了如果$G$是分形的,且$|G':\mathrm{st}_G(1)'|=\infty$是分形的,则$G$的左Engel元的集合$L(G)$是平凡的.这一结果适用于具有无挠阿贝尔化的分形非阿贝尔群,如Basilica群,Brunner-Sidki-Vieira群,也适用于具有常数定义向量的GGS-群。我们还提供了两个例子,表明$|G':\mathrm{st}_G(1)'|=\infty$和分形的要求都不能被丢弃。

英文摘要:

Let $p$ be a prime and let $G$ be a subgroup of a Sylow pro-$p$ subgroup of the group of automorphisms of the $p$-adic tree. We prove that if $G$ is fractal and $|G':\mathrm{st}_G(1)'|=\infty$, then the set $L(G)$ of left Engel elements of $G$ is trivial. This result applies to fractal nonabelian groups with torsion-free abelianization, for example the Basilica group, the Brunner-Sidki-Vieira group, and also to the GGS-group with constant defining vector. We further provide two examples showing that neither of the requirements $|G':\mathrm{st}_G(1)'|=\infty$ and being fractal can be dropped.

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