Arithmetic purity of strong approximation for homogeneous spaces

Arithmetic purity of strong approximation for homogeneous spaces
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齐次空间的强近似的算术纯度

DOI:
10.1016/j.matpur.2019.02.018
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发表时间:
2017-01
影响因子:
2.3
通讯作者:
徐飞
徐飞
中科院分区:
数学1区
文献类型:
--
作者:
Cao Yang;Liang Yongqi;徐飞

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通过建立复曲面簇上半单连通拟可裂线性代数群G的纤维化,证明了数域上codim(G <$U,G)≥ 2的半单连通拟可裂线性代数群G的任何开子集U满足强逼近.我们还证明了一个类似的结果,强逼近Brauer-Manin障碍的部分等变光滑紧的齐性空间,其中所有可逆函数是常数和半单部分的线性代数群是拟分裂。给出了任意维数的半交换簇,其中有理点的补不满足Brauer-Manin阻塞的强逼近。
We prove that any open subset U of a semi-simple simply connected quasi-split linear algebraic group G with codim (G∖ U, G)≥ 2 over a number field satisfies strong approximation by establishing a fibration of G over a toric variety. We also prove a similar result of strong approximation with Brauer–Manin obstruction for a partial equivariant smooth compactification of a homogeneous space where all invertible functions are constant and the semi-simple part of the linear algebraic group is quasi-split. Some semi-abelian varieties of any given dimension where the complements of a rational point do not satisfy strong approximation with Brauer–Manin obstruction are given.
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