Coprime invariable generation and minimal-exponent groups

Coprime invariable generation and minimal-exponent groups
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互质不变生成和最小指数群

DOI:
10.1016/j.jpaa.2014.12.005
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发表时间:
2015
影响因子:
0.8
通讯作者:
Detomi E
Detomi E
中科院分区:
数学2区
文献类型:
--
作者:
Detomi E

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有限群G是互素生成的,如果存在一组生成元{g 1,…,g u},具有以下性质的订单:|g 1|,…,|g u|是两两互素的,且对所有x 1,…,x u∈G集合{g 1 x 1,…证明了如果G是互素不变生成的,则G可以有三个元素生成,如果G是可解的,则G有两个元素,且G的表示秩为零。作为推论,我们证明了:如果G是任一有限群,且没有真子群的指数与G相同,则G的表示秩为零。此外,我们还证明了除了需要三个元素的O8+(2)外,每个有限单群都是由两个元素互素生成的。一路上,我们证明了对每个有限单群S,对每个划分π1,…素数除|S|的素数u,πi元的共轭类的个数kπi(S)的乘积满足≤i=1u k∏i(S)|S|2|出S|.
A finite group G is coprimely invariably generated if there exists a set of generators {g 1,…, g u} of G with the property that the orders| g 1|,…,| g u| are pairwise coprime and that for all x 1,…, x u∈ G the set {g 1 x 1,…, g u x u} generates G. We show that if G is coprimely invariably generated, then G can be generated with three elements, or two if G is soluble, and that G has zero presentation rank. As a corollary, we show that if G is any finite group such that no proper subgroup has the same exponent as G, then G has zero presentation rank. Furthermore, we show that every finite simple group is coprimely invariably generated by two elements, except for O 8+(2) which requires three elements. Along the way, we show that for each finite simple group S, and for each partition π 1,…, π u of the primes dividing| S|, the product of the number k π i (S) of conjugacy classes of π i-elements satisfies∏ i= 1 u k π i (S)≤| S| 2| Out S|.
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