Four-class skew-symmetric association schemes

Four-class skew-symmetric association schemes
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四类倾斜对称关联方案

DOI:
10.1016/j.jcta.2010.12.002
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发表时间:
2009-11
期刊:
Journal of Combinatorial Theory, Ser A
影响因子:
--
通讯作者:
王恺顺
王恺顺
中科院分区:
其他
文献类型:
--
作者:
王恺顺

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如果关联方案除了对角邻接关系之外不存在对称邻接关系,则该关联方案称为斜对称关联方案。在本文中,我们研究了 4 类倾斜对称关联方案。在第一作者最近的工作中发现他们的字符表分为三种类型。我们现在确定它们的交集矩阵。然后我们确定 4 类斜对称伪循环关联方案的字符表,唯一已知的例子是分圆方案。因此,我们回答 S.Y. 提出的问题。 Song 于 1996 年。我们对 4 类原初斜对称关联方案进行了表征和分类。我们还证明了 2 级约翰逊方案都不承认 4 级斜对称裂变方案。基于上述三种类型的字符表,生成可行参数的简短列表。
An association scheme is called skew-symmetric if it has no symmetric adjacency relations other than the diagonal one. In this paper, we investigate 4-class skew-symmetric association schemes. In recent work by the first author it was discovered that their character tables fall into three types. We now determine their intersection matrices. We then determine the character tables for 4-class skew-symmetric pseudocyclic association schemes, the only known examples of which are cyclotomic schemes. As a result, we answer a question raised by S.Y. Song in 1996. We characterize and classify 4-class imprimitive skew-symmetric association schemes. We also prove that none of 2-class Johnson schemes admits a 4-class skew-symmetric fission scheme. Based on three types of character tables above, a short list of feasible parameters is generated.
DOI: 10.1007/s00373-006-0667-y
发表时间: 2007-02
影响因子: 0.7
作者:
Jianmin Ma
通讯作者: Jianmin Ma
DOI: 10.1007/bf00186528
发表时间: 1996
影响因子: 0.8
作者:
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期刊: --
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发表时间: 2009-09
期刊: Eur. J. Comb.
影响因子: --
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DOI: 10.1023/a:1022488330352
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影响因子: 0.8
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