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arXiv 1302.2272math.GR
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关于n-生成亚交换群的交换子群

On abelian subgroups of finitely generated metabelian groups

Vahagn H. Mikaelian, Alexander Yu. Olshanskii

摘要:

本文介绍了与Hall在1950年定义的$\mathcal B$ -群类有关的$\mathcal H$ -群类(或Hall群).建立了Hall群的一些基本性质,利用它们得到了关于阿贝尔群嵌入的结果.特别是,我们给出了一个明确的分类所有的阿贝尔群,可以出现在有限生成的元阿贝尔群的子群。Hall群允许对Baumslag在1990年提出的关于同构类集合的基数的猜想给出否定的回答,该猜想是关于在生成的亚阿贝尔群中阿贝尔子群的同构类集合的基数。

英文摘要:

In this note we introduce the class of $\mathcal H$-groups (or Hall groups) related to the class of $\mathcal B$-groups defined by Ph. Hall in 1950's. Establishing some basic properties of Hall groups we use them to obtain results concerning embeddings of abelian groups. In particular, we give an explicit classification of all abelian groups that can occur as subgroups in finitely-generated metabelian groups. Hall groups allow to give a negative answer to the Baumslag's conjecture of 1990 on the cardinality of the set of isomorphism classes for abelian subgroups in finitely generated metabelian groups.

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