Torus Actions and Cohomology

Torus Actions and Cohomology
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环面作用和上同调

DOI:
10.1007/978-3-662-05071-2_2
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发表时间:
2002
期刊:
--
影响因子:
--
通讯作者:
J. Carrell
J. Carrell
中科院分区:
--
文献类型:
--
作者:
J. Carrell

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每当一个研究代数varietyXon其中一个代数groupGacts,一个自然的问题是几何quantites被保存的行动,即什么是几何不变量?例如,人们可能想知道G-不变开集,G-不变因子,或者可能的话,G-不变点,即G-不动点。如果G是一个代数环面,它的几何不变量往往非常丰富,特别是如果X是射影的。特别地,作用在投射簇上的代数环面总是有不动点。因此,研究一般G-作用的最有成效的方法之一是考虑代数子环面的诱导作用。
Whenever one studies an algebraic varietyXon which an algebraic groupGacts, one of the natural questions is which geometric quantites are preserved by the action, i.e. what are the geometric invariants? For example, one may want to know theG-invariant open sets, theG-invariant divisors or, possibly, theG-invariant points, that is, theG-fixed points. IfGis an algebraic torus, its geometric invariants are often very rich, especially ifXis projective. In particular, an algebraic torus acting on a projective variety always has fixed points. Therefore, one of the most fruitful techniques for studying a generalG-action is to consider the induced action of an algebraic subtorus.
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
T. Kobayashi;T. Oshima
通讯作者: T. Oshima
DOI: --
发表时间: 2022
期刊:
影响因子: --
作者:
Higashitani Akihiro;Tran Tan Nhat;Yoshinaga Masahiko;淺原雅浩;東田全央;Akihiro Higashitani
通讯作者: Akihiro Higashitani