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On Neron-Raynaud class groups of tori and the Capitulation Problem

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arxiv 0903.3221 v1 pith:FG2SIP2F submitted 2009-03-18 math.NT math.AG

On Neron-Raynaud class groups of tori and the Capitulation Problem

classification math.NT math.AG
keywords classgroupsneron-raynaudcapitulationexactfieldsglobalproblem
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We discuss the Capitulation Problem for Neron-Raynaud class groups of tori over global fields F and obtain generalizations of the main results of [10]. We also show that short exact sequences of F-tori induce long exact sequences involving the corresponding Neron-Raynaud class groups. For example, we show that the Neron-Raynaud class group of any F-torus which is split by a metacyclic extension of F can be "resolved" in terms of classical ideal class groups of global fields.

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