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
中科院分区:
文献类型:
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作者:
T. Bliem
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.