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arXiv 2109.02835math.RT
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一类$\mathsf{E}_{6}$和$\mathsf{E}_{7}$型单李代数有限维不可约表示无限族的显式构造

Explicit constructions of some infinite families of finite-dimensional irreducible representations of the type $\mathsf{E}_{6}$ and $\mathsf{E}_{7}$ simple Lie algebras

Robert G. Donnelly, Molly W. Dunkum, Austin White

摘要:

我们构造了$\mathsf{E}_{7}$型单李代数的每一个有限维不可约表示,其最高权是与$\mathsf{E}_{7}$型根系相关的支配极小权的非负整数倍.作为结果,我们得到的结构的每一个有限维不可约表示的简单李代数类型$\mathsf{E}_{6}$的最高权重是一个非负整数线性组合的两个占主导地位的极小$\mathsf{E}$重量。我们的建设是明确的意义上说,如果代表空间是$d$维,然后提供一个权重的基础,使所有条目的$d \times d$代表矩阵的Chevalley发电机是通过明确的,非递归公式。为了实现这项工作,我们介绍了我们所谓的$\mathsf{E}_{6}$ -和$\mathsf{E}_{7}$ -polyminuscule格,类比某些格与著名的特殊线性李代数表示结构获得Gelfand和Tsetlin。

英文摘要:

We construct every finite-dimensional irreducible representation of the simple Lie algebra of type $\mathsf{E}_{7}$ whose highest weight is a nonnegative integer multiple of the dominant minuscule weight associated with the type $\mathsf{E}_{7}$ root system. As a consequence, we obtain constructions of each finite-dimensional irreducible representation of the simple Lie algebra of type $\mathsf{E}_{6}$ whose highest weight is a nonnegative integer linear combination of the two dominant minuscule $\mathsf{E}$-weights. Our constructions are explicit in the sense that, if the representing space is $d$-dimensional, then a weight basis is provided such that all entries of the $d \times d$ representing matrices of the Chevalley generators are obtained via explicit, non-recursive formulas. To effect this work, we introduce what we call $\mathsf{E}_{6}$- and $\mathsf{E}_{7}$-polyminuscule lattices that analogize certain lattices associated with the famous special linear Lie algebra representation constructions obtained by Gelfand and Tsetlin.

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