Some problems of Wielandt revisited

Some problems of Wielandt revisited
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重新审视维兰特的一些问题

DOI:
10.1016/j.jalgebra.2005.09.013
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发表时间:
2006
期刊:
影响因子:
0.9
通讯作者:
W. Knapp
W. Knapp
中科院分区:
数学3区
文献类型:
--
作者:
W. Knapp

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本文讨论了H. Wielandt受到新方法和传统方法的攻击。给出了一种新的方法,即群G的半单子群A正规化一个与A同构的子群B,迫使B在AB中的中心化子非平凡,因此B不是其正规化子的广义Fitting子群.这个定理被应用于证明一个本原置换群G的成对子成分[公式:见正文]是忠实的,如果非平凡子成分GαΔ(α)是正则的。如果GαΔ(α)是一个非交换单群,其所有真子群都是可解的,则GαΔ(α)的正则性甚至意味着GαΔ(α)是忠实的.对于非平凡子成分GαΔ(α)是幂零的,或者更一般地,对于β∈Δ(α),Gαβ在Gα中是次正规的,也得到了几个定理.
Several problems in the theory of finite permutation groups considered before by H. Wielandt are attacked by new and traditional methods. One new method is given by the theorem that a semisimple subgroup A of a group G normalizing a different subgroup B isomorphic to A forces that the centralizer in AB of B is non-trivial, hence B is not the generalized Fitting subgroup of its normalizer. This theorem is applied in proving that the paired subconstituent [Formula: see text] of a primitive permutation group G is faithful if the non-trivial subconstituent GαΔ(α)is regular. If GαΔ(α)is a non-abelian simple group all of whose proper subgroups are solvable then the regularity of GαΔ(α)even implies that GαΔ(α)is faithful. Also several theorems are obtained for the case that a non-trivial subconstituent GαΔ(α)is nilpotent or, more generally, that Gαβis subnormal in Gαfor β∈Δ(α).
Primitive Permutationsgruppen mit einem Subkonstituenten, dessen Stabilisatorgruppe Fitting-frei ist
DOI: --
发表时间: 1974
期刊:
影响因子: --
作者:
W. Knapp
通讯作者: W. Knapp