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A cohomological obstruction to weak approximation for homogeneous spaces
Published 7 Dec 2010 in math.NT and math.AG | (1012.1453v2)
Abstract: 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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