Normal affine surfaces with C*-actions

Normal affine surfaces with C*-actions
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具有 C* 作用的法线仿射曲面

DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
M. Zaidenberg
M. Zaidenberg
中科院分区:
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文献类型:
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作者:
H. Flenner;M. Zaidenberg

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Bia{l}ynicki-Birula、Fieseler 和 L. Kaup、Orlik 和 Wagreich、Rynes 等人的工作中给出了允许 $ f C^*$ 作用的正态仿射曲面的分类。我们通过分级环以及定义方程来提供此类表面的简单替代描述。这是基于双曲分级情况下 Dolgachev-Pinkham-Demazure 结构的概括。作为一种应用,我们确定奇点的结构、轨道的结构以及此类表面的除数类组。
A classification of normal affine surfaces admitting a $f C^*$-action was given in the work of Bia{l}ynicki-Birula, Fieseler and L. Kaup, Orlik and Wagreich, Rynes and others. We provide a simple alternative description of such surfaces in terms of their graded rings as well as by defining equations. This is based on a generalization of the Dolgachev-Pinkham-Demazure construction in the case of a hyperbolic grading. As an apllication we determine the structure of singularities, of the orbits and the divisor class groups for such surfaces.