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arXiv math/0604519math.QAmath.RA
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Coxeter群的群代数II的新变形

New deformations of group algebras of Coxeter groups, II

Pavel Etingof, Eric Rains

摘要:

在我们的前一篇论文math.QA/0409261中,我们定义了Coxeter群W的偶元素群的群代数的变形,并证明了它对所有参数值是平坦的当且仅当W的所有秩3抛物子群是无限的.在本文中,我们研究在一般情况下发生了什么。则变形仅对某些参数值是平坦的,所有这些值的集合称为平坦轨迹。本文的主要结果是明确地描述了这种平坦性轨迹作为一个计划在Z。更具体地说,我们表明,该计划是相交的平坦轨迹的子代数对应的抛物子群秩3。后者通过求解刚性乘法Deligne-Simpson问题来确定。我们还定义了我们的代数添加剂类似物,并研究其性质。

英文摘要:

In our previous paper math.QA/0409261, we defined a deformation of the group algebra of the group of even elements of a Coxeter group W, and showed that it is flat for all values of parameters if and only if all the rank 3 parabolic subgroups of W are infinite. In this paper, we study what happens in the general case. Then the deformation is flat only for some values of parameters, and the set of all such values is called the flatness locus. The main result of the paper is an explicit description of the this flatness locus as a scheme over Z. More specifically, we show that this scheme is the intersection of the flatness loci for the subalgebras corresponding to parabolic subgroups of rank 3. The latter are determined by solving the rigid multiplicative Deligne-Simpson problem. We also define additive analogs of our algebras and study their properties.

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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