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arXiv 1012.1453math.NTmath.AG
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齐性空间弱逼近的上同调障碍

A cohomological obstruction to weak approximation for homogeneous spaces

Mikhail Borovoi, Tomer M. Schlank

摘要:

设X是齐性空间,X = G/H,其中G是数域k上的连通线性代数群,H是G的k-子群(不一定连通).设S是k的位置的有限集。我们计算了Brauer-Manin对X在S中的弱逼近的阻碍。

英文摘要:

Let X be a homogeneous space, X = G/H, where G is a connected linear algebraic group over a number field k, and H is a k-subgroup of G (not necessarily connected). Let S be a finite set of places of k. We compute the Brauer-Manin obstruction to weak approximation for X in S in terms of Galois cohomology.

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