Four-class skew-symmetric association schemes
Four-class skew-symmetric association schemes
复制标题
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:
影响因子:
--
通讯作者:
王恺顺
中科院分区:
文献类型:
--
作者:
王恺顺
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.
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影响因子:
0.7
作者:
Jianmin Ma
通讯作者:
Jianmin Ma
影响因子:
0.8
作者:
Sung Y. Song
通讯作者:
Sung Y. Song
DOI:
10.1017/cbo9780511623714.004
发表时间:
2003
期刊:
--
影响因子:
--
作者:
通讯作者:
--
DOI:
10.1016/j.ejc.2010.04.004
发表时间:
2009-09
期刊:
Eur. J. Comb.
影响因子:
--
作者:
Jianmin Ma
通讯作者:
Jianmin Ma
影响因子:
0.8
作者:
Sung Y. Song
通讯作者:
Sung Y. Song