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arXiv 1809.04837math.RT
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半单李代数权重数计算的一种新方法

A new method of weight multiplicities evaluation for semi-simple Lie algebras

Anatoli Loutsiouk

摘要:

在半单李群和代数表示论的大多数应用中,计算权重数是最常用和最费工的运算之一。现有的工具是多年前由Kostant和Freudenthal创建的。著名的Kostant权重多重公式使用Kostant分拆函数的值的外尔群的求和,并且Freudenthal公式是递归的。本文提出了一种计算权重数的新方法。该方法不使用外尔群,是直接的,不是递归的。根据这种方法实现的算法比以前采用的技术实现的算法快得多。给出了用Fortran语言实现的程序实例。它们可以在台式机和笔记本电脑上编译和执行。

英文摘要:

In most applications of semi-simple Lie groups and algebras representation theory, calculating weight multiplicities is one of the most often used and effort consuming operations. The existing tools were created many years ago by Kostant and Freudenthal. The celebrated Kostant weight multiplicity formula uses summation over the Weyl group of values of Kostant partition function, and the Freudenthal formula is recurrent. In this paper, a new way for calculating weight multiplicities is presented. The method does not employ the Weyl group and is direct, not recurrent. The algorithm realized in accordance with this method is much faster than those realized with the previously employed techniques. Many examples of programs realized in Fortran language are given. They are ready for compilation and execution on desktop and laptop computers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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