Chopped and sliced cones and representations of Kac–Moody algebras

Chopped and sliced cones and representations of Kac–Moody algebras
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切碎和切片锥体以及 Kac-Moody 代数的表示

DOI:
10.1016/j.jpaa.2009.10.002
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发表时间:
2009
影响因子:
0.8
通讯作者:
T. Bliem
T. Bliem
中科院分区:
数学2区
文献类型:
--
作者:
T. Bliem

文献摘要

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在组合几何中引入了切割锥的概念,并利用向量配分函数证明了一个表示切割锥切片上积分点个数的结构定理。我们观察到这个概念适用于Kac-Moody代数的权重数和半单李代数的Clebsch-Gordan系数。这具有算法应用,正如我们演示的计算一些明确的例子。
We introduce the notion of a chopped and sliced cone in combinatorial geometry and prove a structure theorem expressing the number of integral points in a slice of such a cone by means of a vector partition function. We observe that this notion applies to weight multiplicities of Kac–Moody algebras and to Clebsch–Gordan coefficients for semisimple Lie algebras. This has algorithmic applications, as we demonstrate computing some explicit examples.