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arXiv 1603.02112math.GR
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无限锐乘传递群

Infinite sharply multiply transitive groups

Katrin Tent

摘要:

Zassenhaus在20世纪30年代对有限锐$2$ -传递群进行了分类。它们本质上都看起来像某个场(或至少近场)$K$的仿射线性变换群$x\mapsto ax+b$。然而,问题仍然是开放的,是否同样适用于无限的急剧$2$ -传递群。已经有大量的工作与这些群体的结构表明,Zassenhaus的结果可能会扩展到无限的设置。对于许多特定的群类,如李群、线性群或可在o-极小中定义的群,确实证明了给定类内的所有例子都以这种方式产生为仿射群。然而,最近发现,缺乏一般证明的原因是,存在大量不是由场或近场产生的严格$2$ -传递群!事实上,构造具体的例子并不太难(见下文)。本文综述了一般的$n$ -传递群,并描述了如何构造非域上的例子。

英文摘要:

The finite sharply $2$-transitive groups were classified by Zassenhaus in the 1930's. They essentially all look like the group of affine linear transformations $x\mapsto ax+b$ for some field (or at least near-field) $K$. However, the question remained open whether the same is true for infinite sharply $2$-transitive groups. There has been extensive work on the structures associated to such groups indicating that Zassenhaus' results might extend might extend to the infinite setting. For many specific classes of groups, like Lie groups, linear groups, or groups definable in o-minimal it was indeed proved that all examples inside the given class arise in this way as affine groups. However, it recently turned out that the reason for the lack of a general proof was the fact that there are plenty of sharply $2$-transitive groups which do not arise from fields or near-fields! In fact, it is not too hard to construct concrete examples (see below). In this note, we survey general sharply $n$-transitive groups and describe how to construct examples not arising from fields.

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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