Periods of principal homogeneous spaces of algebraic tori

Periods of principal homogeneous spaces of algebraic tori
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代数环面主齐次空间的周期

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发表时间:
2010
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通讯作者:
A. S. Merkur’ev
A. S. Merkur’ev
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文献类型:
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作者:
A. S. Merkur’ev

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域F上代数环面S的一般环量是S-环量P→T的一般纤维,其中P是包含S为子群的拟平凡环面,且T = P/S。在域扩展K/F上的广义S-量的周期,即群Hp1(K, S)中广义S-量的阶与广义S-量的选择无关。本文根据环面S的特征格计算了S的一般环量的周期。
A generic torsor of an algebraic torus S over a field F is the generic fiber of a S-torsor P → T, where P is a quasi-trivial torus containing S as a subgroup and T = P/S. The period of a generic S-torsor over a field extension K/F, i.e., the order of the class of the torsor in the group Hp1(K, S) does not depend on the choice of a generic torsor. In the paper we compute the period of a generic torsor of S in terms of the character lattice of the torus S.