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arXiv 1606.09438math.CO
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与TI-子群相关的相干组态

Coherent configurations associated with TI-subgroups

Gang Chen, Ilia Ponomarenko

摘要:

设X是与传递群G相关联的凝聚组态.根据X的相交数,建立了G的点稳定子是TI-子群的一个必要条件.在此条件下,X由相交数同构地确定。证明了该条件也是渐近充分的。更精确地说,满足这个条件的任意齐次相干组态都与一个传递群相关联,它的点稳定子是一个TI-子群。作为理论发展的一个副产品,伪循环和准稀疏结合方案的最新结果得到了推广和改进。特别地,证明了任何素数度为p且效价为k的概型都与一个传递群相关联,只要p>1+ 6 k(k-1)^[2]。

英文摘要:

Let X be a coherent configuration associated with a transitive group G. In terms of the intersection numbers of X, a necessary condition for the point stabilizer of G to be a TI-subgroup, is established. Furthermore, under this condition, X is determined up to isomorphism by the intersection numbers. It is also proved that asymptotically, this condition is also sufficient. More precisely, an arbitrary homogeneous coherent configuration satisfying this condition is associated with a transitive group, the point stabilizer of which is a TI-subgroup. As a byproduct of the developed theory, recent results on pseudocyclic and quasi-thin association schemes are generalized and improved. In particular, it is shown that any scheme of prime degree p and valency k is associated with a transitive group, whenever p>1+6k(k-1)^2.

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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