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arXiv math/0506171math.AGmath.ACmath.RTmath.SG
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辛表示上的不变函数

Invariant functions on symplectic representations

Friedrich Knop

摘要:

设G是连通约化群.本文研究辛G-模的不变量理论。我们的主要结果是不变矩映射是等维的。我们推导出范畴商是具有有理一般纤维的仿射空间上的纤维化。特别令人感兴趣的是那些模块的通用轨道是各向同性。我们证明它们是自由的。这一结果已在另一篇论文(数学SG/0505268)中用于对所有这些模块进行分类。我们的主要工具是局部结构定理的辛形式。

英文摘要:

Let G be a connected reductive group. In this paper we are studying the invariant theory of symplectic G-modules. Our main result is that the invariant moment map is equidimensional. We deduce that the categorical quotient is a fibration over an affine space with rational generic fibers. Of particular interest are those modules for which the generic orbit is coisotropic. We prove that they are cofree. This result has been used in another paper (math.SG/0505268) to classify all these modules. Our main tool is a symplectic version of the local structure theorem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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