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arXiv 1002.0320math.GR
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迭代圈积的有限生成

Finite generation of iterated wreath products

Ievgen Bondarenko

摘要:

设$(G_n,X_n)$是生成元个数一致有界的有限可迁置换群序列。我们证明了无限迭代置换环积$...\wr G_2\wr G_1$是拓扑可生成的当且仅当有限交换群$\prod_{n\geq 1} G_n/G'_n$是拓扑可生成的.作为推论,对于有限可传递群$G$,若$G$是完全群,则其圈幂$G\wr...\wr G\wr G$($n$倍)的生成元的最小数目是有界的;若$G$是非完全群,则其圈幂的生成元的最小数目线性增长.作为副产品,我们构造了一个具有无穷指数的极大子群的生成分支群,回答了[2,问题14]。

英文摘要:

Let $(G_n,X_n)$ be a sequence of finite transitive permutation groups with uniformly bounded number of generators. We prove that the infinitely iterated permutational wreath product $...\wr G_2\wr G_1$ is topologically finitely generated if and only if the profinite abelian group $\prod_{n\geq 1} G_n/G'_n$ is topologically finitely generated. As a corollary, for a finite transitive group $G$ the minimal number of generators of the wreath power $G\wr...\wr G\wr G$ ($n$ times) is bounded if $G$ is perfect, and grows linearly if $G$ is non-perfect. As a by-product we construct a finitely generated branch group, which has maximal subgroups of infinite index, answering [2,Question 14].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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