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arXiv 1606.04424math.RT
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交替群与对称群的Gelfand-Tsetlin基的比较

Comparison of Gelfand-Tsetlin Bases for Alternating and Symmetric Groups

T. Geetha, Amritanshu Prasad

摘要:

杨氏正交基是对称群的不可约表示的经典基。该基恰好是对称群链的Gelfand-Tsetlin基。众所周知,交错群链和对称群链一样,对不可约表示有无重数限制。因此,交错群的每个不可约表示也容许Gelfand-Tsetlin基。此外,每个这样的表示要么是对对称群的不可约表示的限制,要么是对对称群的不可约表示的限制的子表示。在这篇文章中,我们描述了一个递归算法,以写出的对称群的环境表示的杨氏正交基的交替群的不可约表示的每个Gelfand-Tsetlin基向量的扩展。该算法是用Sage数学软件实现的。

英文摘要:

Young's orthogonal basis is a classical basis for an irreducible representation of a symmetric group. This basis happens to be a Gelfand-Tsetlin basis for the chain of symmetric groups. It is well-known that the chain of alternating groups, just like the chain of symmetric groups, has multiplicity-free restrictions for irreducible representations. Therefore each irreducible representation of an alternating group also admits Gelfand-Tsetlin bases. Moreover, each such representation is either the restriction of, or a subrepresentation of, the restriction of an irreducible representation of a symmetric group. In this article, we describe a recursive algorithm to write down the expansion of each Gelfand-Tsetlin basis vector for an irreducible representation of an alternating group in terms of Young's orthogonal basis of the ambient representation of the symmetric group. This algorithm is implemented with the Sage Mathematical Software.

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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