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arXiv 1209.0954math.GRmath.CO
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作为对称群的子群的直射变换群

Collineation group as a subgroup of the symmetric group

Fedor Bogomolov, Marat Rovinsky

摘要:

令$Ψ$为投影化(即,一维向量子空间的集合)在域上的维度为$\ge 3$的向量空间的集合。设$H$是集合$Ψ$的置换群$\mathfrak{S}_Ψ$的闭(在逐点收敛拓扑中)子群。设$H$包含射影群和$Ψ$的任意自双射,它将共线点三元组变换为非共线点三元组。从\cite{KantorMcDonough}可知,如果$Ψ$是有限的,则$H$包含$\mathfrak{S}_Ψ$的交替子群$\mathfrak{A}_Ψ$。我们在下面的定理\ref{density}中证明,如果$Ψ$是无限的,则$H=\mathfrak{S}_Ψ$。

英文摘要:

Let $Ψ$ be the projectivization (i.e., the set of one-dimensional vector subspaces) of a vector space of dimension $\ge 3$ over a field. Let $H$ be a closed (in the pointwise convergence topology) subgroup of the permutation group $\mathfrak{S}_Ψ$ of the set $Ψ$. Suppose that $H$ contains the projective group and an arbitrary self-bijection of $Ψ$ transforming a triple of collinear points to a non-collinear triple. It is well-known from \cite{KantorMcDonough} that if $Ψ$ is finite then $H$ contains the alternating subgroup $\mathfrak{A}_Ψ$ of $\mathfrak{S}_Ψ$. We show in Theorem \ref{density} below that $H=\mathfrak{S}_Ψ$, if $Ψ$ is infinite.

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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