Fixed point ratios for finite primitive groups and applications

Fixed point ratios for finite primitive groups and applications
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有限基元组和应用的定点比率

DOI:
10.1016/j.aim.2022.108778
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发表时间:
2022
影响因子:
1.7
通讯作者:
Guralnick, Robert M.
Guralnick, Robert M.
中科院分区:
数学1区
文献类型:
--
作者:
Burness, Timothy C.;Guralnick, Robert M.

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设G是集Ω上的有限本原置换群,记为∈(X)的元素x的不动点比是Ω中x不动点的比例。在这种情况下的不动点比已经研究了几十年,得到了广泛的应用。在本文中,我们比较了Fpr(X)与x的阶。我们的主要定理给出了如上所述的三元组(G,Ω,x)的分类,其性质是x具有素数阶且Fpr(X)>1/(r+1)。有几个应用程序。首先,我们推广了Guralnick和Magaard的工作,确定了最小次数至多为2 m/3的m阶本原置换群。其次,我们的主要结果在最近与Moretó和Navarro关于有限群中p元的交换概率的联合工作中起到了关键作用。最后,我们利用我们的主要定理研究了本原置换群的极小指标,从而回答了Bhargava的一个问题。
Let G be a finite primitive permutation group on a set Ω and recall that the fixed point ratio of an element x∈ G, denoted fpr (x), is the proportion of points in Ω fixed by x. Fixed point ratios in this setting have been studied for many decades, finding a wide range of applications. In this paper, we are interested in comparing fpr (x) with the order of x. Our main theorem provides a classification of the triples (G, Ω, x) as above with the property that x has prime order r and fpr (x)> 1/(r+ 1). There are several applications. Firstly, we extend earlier work of Guralnick and Magaard by determining the primitive permutation groups of degree m with minimal degree at most 2 m/3. Secondly, our main result plays a key role in recent joint work with Moretó and Navarro on the commuting probability of p-elements in finite groups. Finally, we use our main theorem to investigate the minimal index of a primitive permutation group, which allows us to answer a question of Bhargava.
有限经典群作用中的不动点比率,III
DOI: 10.1016/j.jalgebra.2006.05.024
发表时间: 2007
期刊: Journal of Algebra
影响因子: 0.9
作者:
Timothy C. Burness
通讯作者: Timothy C. Burness
DOI: 10.4007/annals.2021.193.2.5
发表时间: 2020-06
期刊: arXiv: Group Theory
影响因子: --
作者:
Timothy C. Burness;R. Guralnick;Scott Harper
通讯作者: Timothy C. Burness;R. Guralnick;Scott Harper
DOI: 10.1007/s11856-020-2050-8
发表时间: 2020-07-27
影响因子: 1
作者:
Burness, Timothy C.;Harper, Scott
通讯作者: Harper, Scott
DOI: 10.1006/jabr.2000.8357
发表时间: 2000
期刊: --
影响因子: --
作者:
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通讯作者: R. Guralnick;W. Kantor
具有反转许多元素的自同构的不可解群
DOI: 10.1007/bf01190221
发表时间: 1988
影响因子: 0.6
作者:
Walter M. Potter
通讯作者: Walter M. Potter