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arXiv math/0409261math.QAmath.RA
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Coxeter群的群代数的新变形

New deformations of group algebras of Coxeter groups

Pavel Etingof, Eric Rains

摘要:

我们定义了Coxeter群W的群代数和其中偶元素的子群的新变形,通过变形的辫子关系。我们证明了这些变形是代数平坦的当且仅当它们是形式平坦的,并且当且仅当群W没有秩为3的有限抛物子群。证明使用了附着在W上的胞腔复形上的可构造层理论。我们解释了我们的变形与第一作者在数学QA/0406499中定义的Orbifolds的Hecke代数以及作者和A.奥布洛姆科夫数学QA/0406480这份报纸是为了纪念沃尔特·费特而写的。

英文摘要:

We define new deformations of group algebras of Coxeter groups W and of subgroups of even elements in them, by deforming the braid relations. We show that these deformations are algebraically flat iff they are formally flat, and that this happens iff the group W has no finite parabolic subgroups of rank 3. The proof uses the theory of constructible sheaves on cell complexes attached to W. We explain the connection of our deformations with the Hecke algebras of orbifolds defined by the first author in math.QA/0406499 and with generalized double affine Hecke algebras defined by the authors and A. Oblomkov in math.QA/0406480. The paper is dedicated to the memory of Walter Feit.

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