Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4647386 | Discrete Mathematics | 2013 | 7 Pages |
Abstract
A graph Î is called X-arc-regular with Xâ¤AutÎ if X acts regularly on its arc set, while Î is called arc-regular if X=AutÎ. J.X. Zhou and Y.Q. Feng [Cubic one-regular graphs of order twice a square-free integer, Sci. China Ser. A 51 (2008) 1093-1100] proved that there is no cubic arc-regular graph of order four times an odd square-free integer. In this paper, we shall generalize this result by showing that there is no arc-regular p-valent graph of order four times an odd square-free integer for each odd prime p. Moreover, we prove that there are exactly two specific infinite families of X-arc-regular graphs Î with X a proper subgroup of AutÎ.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
Jiangmin Pan, Yin Liu,