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arXiv 2102.02190math.GR
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扭圈积制品的底座

Bases of twisted wreath products

Joanna B. Fawcett

摘要:

本文研究了扭环型有限拟本原置换群的基大小,这类置换群是指具有唯一极小正规子群的有限置换群,且该极小正规子群也是非交换的、非单的、正则的.扭环型置换群的置换同构于作用在其基群$Ω=T^k$上的扭环积$G=T^k{:}P$,其中$T$是某个非交换单群,$P$是某个群,它与$k\geq 2$传递地作用在$\boldsymbol{k}=\{1,\ldots,k\}$上.证明了如果$G$是$Ω$上的本原,$P$是$\boldsymbol{k}$上的拟本原,则$G$的基大小为2.我们还证明了当$G$在PDMATHAMT上是本原的,PDMATHAMP在$\boldsymbol{k}$上是本原的时,作为$|G|\to \infty$的$G$的基的点对的比例趋于1。最后,我们确定的基本尺寸的任何quasiprimitive扭曲的花环类型的群多达四个可能的值(和三个原始的情况下)。特别是,我们证明了有许多家庭的扭曲的花圈型的原始群任意大的基础大小。

英文摘要:

We study the base sizes of finite quasiprimitive permutation groups of twisted wreath type, which are precisely the finite permutation groups with a unique minimal normal subgroup that is also non-abelian, non-simple and regular. Every permutation group of twisted wreath type is permutation isomorphic to a twisted wreath product $G=T^k{:}P$ acting on its base group $Ω=T^k$, where $T$ is some non-abelian simple group and $P$ is some group acting transitively on $\boldsymbol{k}=\{1,\ldots,k\}$ with $k\geq 2$. We prove that if $G$ is primitive on $Ω$ and $P$ is quasiprimitive on $\boldsymbol{k}$, then $G$ has base size 2. We also prove that the proportion of pairs of points that are bases for $G$ tends to 1 as $|G|\to \infty$ when $G$ is primitive on $Ω$ and $P$ is primitive on $\boldsymbol{k}$. Lastly, we determine the base size of any quasiprimitive group of twisted wreath type up to four possible values (and three in the primitive case). In particular, we demonstrate that there are many families of primitive groups of twisted wreath type with arbitrarily large base sizes.

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