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arXiv 2104.13355math.GR
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存在对角型的同步本原群

Synchronising primitive groups of diagonal type exist

John Bamberg, Michael Giudici, Jesse Lansdown, Gordon F. Royle

摘要:

每一个同步置换群都是本原的,并且是三种类型之一:仿射的、几乎单的或对角的。我们展示了第一个已知的同步对角型群的例子。更准确地说,我们表明,$\mathrm{PSL}(2,q)\times \mathrm{PSL}(2,q)$作用在其对角行动对$\mathrm{PSL}(2,q)$是分离的,因此同步,为$q=13$和$q=17$。此外,我们表明,这样的群体是非扩展的所有素数权力$q$。

英文摘要:

Every synchronising permutation group is primitive and of one of three types: affine, almost simple, or diagonal. We exhibit the first known example of a synchronising diagonal type group. More precisely, we show that $\mathrm{PSL}(2,q)\times \mathrm{PSL}(2,q)$ acting in its diagonal action on $\mathrm{PSL}(2,q)$ is separating, and hence synchronising, for $q=13$ and $q=17$. Furthermore, we show that such groups are non-spreading for all prime powers $q$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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