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arXiv 1912.06985math.AG
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有些自同构群是线性代数的

Some automorphism groups are linear algebraic

Michel Brion

摘要:

考虑正规投射簇$X$,Aut($X$)的线性代数子群$G$,以及$X$上的$G$ -不变有理函数的域$K$。我们证明了Aut($X$)的点固定$K$的子群是线性代数的.若$K$对$k$有超越度$1$,则Aut($X$)是一个代数群。

英文摘要:

Consider a normal projective variety $X$, a linear algebraic subgroup $G$ of Aut($X$), and the field $K$ of $G$-invariant rational functions on $X$. We show that the subgroup of Aut($X$) that fixes $K$ pointwise is linear algebraic. If $K$ has transcendence degree $1$ over $k$, then Aut($X$) is an algebraic group.

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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