The rank gradient from a combinatorial viewpoint

The rank gradient from a combinatorial viewpoint
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从组合的角度来看排名梯度

DOI:
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发表时间:
2007
期刊:
影响因子:
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通讯作者:
N. Nikolov
N. Nikolov
中科院分区:
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文献类型:
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作者:
Miklós Abért;A. Jaikin‐Zapirain;N. Nikolov

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本文研究了剩余有限群中有限指数子群的生成元的最小数目的渐近性态。我们分析了三个自然类的群体:顺从的群体,群体拥有一个无限的可溶正常的子群和几乎自由的群体。作为一种工具,我们推广了Lackenby的可分性定理的可分性的情况下,提出了群。
This paper investigates the asymptotic behaviour of the minimal number of generators of finite index subgroups in residually finite groups. We analyze three natural classes of groups: amenable groups, groups possessing an infinite soluble normal subgroup and virtually free groups. As a tool for the amenable case we generalize Lackenby’s trichotomy theorem on finitely presented groups.