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arXiv math/0403129math.GRmath.GT
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大的非对称呈现群体的特征

A characterisation of large finitely presented groups

Marc Lackenby

摘要:

一个群称为“大”群,如果某个有限指数子群允许一个满同态到一个非交换的自由群上。本文利用正规列的存在性,给出了一个群是大群的充要条件,其中连续的正子是具有充分大秩和阶的有限阿贝尔群.这个结果的证明涉及到有限Cayley图的几何和拓扑分析。Baumslag和Pride的定理,以及Gromov和Stohr对生成元比关系多的群的扩展,立即遵循。

英文摘要:

A group is known as `large' if some finite index subgroup admits a surjective homomorphism onto a non-abelian free group. In this paper, we give a necessary and sufficient condition for a finitely presented group to be large, in terms of the existence of a normal series where successive quotients are finite abelian groups with sufficiently large rank and order. The proof of this result involves an analysis of the geometry and topology of finite Cayley graphs. Theorems of Baumslag and Pride, and their extensions by Gromov and Stohr, on groups with more generators than relations, follow immediately.

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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