Closed subsets in duals of commutative table algebras

Closed subsets in duals of commutative table algebras
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交换表代数对偶中的闭子集

DOI:
10.1016/j.jalgebra.2012.09.040
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发表时间:
2013
期刊:
影响因子:
0.9
通讯作者:
Chen, Gang
Chen, Gang
中科院分区:
数学3区
文献类型:
--
作者:
Blau, Harvey I.;Chen, Gang

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本文给出了具有对偶表代数的交换C-代数的C-基的闭子集外的元素个数的一个下界,以及满足该下界的一个等价条件.作为推论,得到了交换非本原结合方案的邻接代数中秩大于1的本原幂等矩阵个数的下界;对于有限群G的给定正规子群N,得到了G的核不包含N的不可约特征标个数的下界,以及G的共轭类个数的下界.还发现,当这些下限得到满足的等价条件。
A lower bound on the number of elements outside a closed subset of aC-basis of a commutativeC-algebra with dual a table algebra is derived, as is an equivalent condition for when the lower bound is met. As corollaries, lower bounds are obtained on the number of primitive idempotent matrices of rank greater than 1 in the adjacency algebra of a commutative, imprimitive association scheme; and, for a given normal subgroupNof a finite groupG, on the number of irreducible characters ofGwhose kernels do not containN, and on the number of conjugacy classes ofGnot contained inN. Also found are equivalent conditions for when these lower bounds are met.
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发表时间: 1995-07
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