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arXiv 1002.0628math.COmath.GR
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平衡相干光的特征

Characterization of Balanced Coherent Configurations

Mitsugu Hirasaka, Reza Sharafdini

摘要:

设$G$是作用在有限集$Ω$上的群.然后$G$通过它的入口方向作用作用于$Ω\times Ω$,它的轨道形成一个相干位形(或简称方案)的基关系。我们关心的是考虑以下假设:只要$Ω_i$和$Ω_j$是$G$在$Ω$上的轨道,则$G$在$Ω_i\times Ω_j$上的轨道数不变。从$G$对${Ω_i}$的动作具有相同的置换特征并且不一定等价的假设可以得出结论。从这个观点出发,人们可能会问,一个给定的群有多少不等价的作用具有相同的置换特征标。在这篇文章中,我们将接近这个问题的纯组合方法的计划,并研究以下主题:(i)平衡计划和他们的中心本原幂等元,(ii)约化平衡计划的特征。

英文摘要:

Let $G$ be a group acting on a finite set $Ω$. Then $G$ acts on $Ω\times Ω$ by its entry-wise action and its orbits form the basis relations of a coherent configuration (or shortly scheme). Our concern is to consider what follows from the assumption that the number of orbits of $G$ on $Ω_i\times Ω_j$ is constant whenever $Ω_i$ and $Ω_j$ are orbits of $G$ on $Ω$. One can conclude from the assumption that the actions of $G$ on ${Ω_i}$'s have the same permutation character and are not necessarily equivalent. From this viewpoint one may ask how many inequivalent actions of a given group with the same permutation character there exist. In this article we will approach to this question by a purely combinatorial method in terms of schemes and investigate the following topics: (i) balanced schemes and their central primitive idempotents, (ii) characterization of reduced balanced schemes.

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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