Separability and complete reducibility of subgroups of the Weyl group of a simple algebraic group of type E7

Separability and complete reducibility of subgroups of the Weyl group of a simple algebraic group of type E7
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E7 型简单代数群的 Weyl 群子群的可分离性和完全可归约性

DOI:
10.1016/j.jalgebra.2014.09.021
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发表时间:
2013
期刊:
影响因子:
0.9
通讯作者:
T. Uchiyama
T. Uchiyama
中科院分区:
数学3区
文献类型:
--
作者:
T. Uchiyama

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设G是定义在代数闭域k上的连通约化代数群。本文的目的是提出一种方法来寻找三元组(G,M,H)具有以下三个性质。性质1:G是简单的,k具有特征2。性质2:H和M是G的闭约化子群,使得H< M< G,且(G,M)是约化对。性质3:H是G-完全可约的,但不是M-完全可约的。我们展示我们的方法,提出了一个新的例子,这样的三元组G= E 7。然后,我们考虑的合理性问题和共轭类的问题作为我们的建设的重要应用。
Let G be a connected reductive algebraic group defined over an algebraically closed field k. The aim of this paper is to present a method to find triples (G, M, H) with the following three properties. Property 1: G is simple and k has characteristic 2. Property 2: H and M are closed reductive subgroups of G such that H< M< G, and (G, M) is a reductive pair. Property 3: H is G-completely reducible, but not M-completely reducible. We exhibit our method by presenting a new example of such a triple in G= E 7. Then we consider a rationality problem and a problem concerning conjugacy classes as important applications of our construction.
完全可归约性和通勤子群
DOI: 10.1515/crelle.2008.063
发表时间: 2008
期刊: Journal für die reine und angewandte Mathematik (Crelles Journal)
影响因子: --
作者:
Bate M
通讯作者: Bate M