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arXiv 1808.01428math.CO
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具有小效价的距离正则Cayley图

Distance-regular Cayley graphs with small valency

Edwin R. van Dam, Mojtaba Jazaeri

摘要:

研究了小效价的距离正则图是Cayley图的问题。我们确定了距离正则的Cayley图中的最大效价为$4$的Cayley图,距离正则图中的最大效价为$5$的已知假定交叉阵列的Cayley图,以及距离正则图中的最大效价为$6$或$7$且围长为$3$的Cayley图.我们得到了Desklesian仿射平面减去平行线类的关联图是Cayley图。我们证明了已知广义六边形的关联图不是Cayley图,也证明了一些由小广义四边形或广义六边形生成的距离正则图不是Cayley图.在一些"例外“的小效价距离正则图中,我们发现Armanios-Wells图和Klein图是Cayley图.

英文摘要:

We consider the problem of which distance-regular graphs with small valency are Cayley graphs. We determine the distance-regular Cayley graphs with valency at most $4$, the Cayley graphs among the distance-regular graphs with known putative intersection arrays for valency $5$, and the Cayley graphs among all distance-regular graphs with girth $3$ and valency $6$ or $7$. We obtain that the incidence graphs of Desarguesian affine planes minus a parallel class of lines are Cayley graphs. We show that the incidence graphs of the known generalized hexagons are not Cayley graphs, and neither are some other distance-regular graphs that come from small generalized quadrangles or hexagons. Among some ``exceptional'' distance-regular graphs with small valency, we find that the Armanios-Wells graph and the Klein graph are Cayley graphs.

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