论文标题
Neumaier图形很少有特征值
Neumaier graphs with few eigenvalues
论文作者
论文摘要
Neumaier图是一个不完整的边缘规则图,其中包含常规集团。在本文中,我们给出了一些足够和必要的条件,使Neumaier图非常规律。此外,我们表明,不存在具有四个不同特征值的Neumaier图。我们还确定了最小特征值-2的Neumaier图。
A Neumaier graph is a non-complete edge-regular graph containing a regular clique. In this paper we give some sufficient and necessary conditions for a Neumaier graph to be strongly regular. Further we show that there does not exist Neumaier graphs with exactly four distinct eigenvalues. We also determine the Neumaier graphs with smallest eigenvalue -2.