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FINITE TWO-DISTANCE-TRANSITIVE DIHEDRANTS
Published online by Cambridge University Press: 26 January 2022
Abstract
A noncomplete graph is $2$ -distance-transitive if, for $i \in \{1,2\}$ and for any two vertex pairs $(u_1,v_1)$ and $(u_2,v_2)$ with the same distance i in the graph, there exists an element of the graph automorphism group that maps $(u_1,v_1)$ to $(u_2,v_2)$ . This paper determines the family of $2$ -distance-transitive Cayley graphs over dihedral groups, and it is shown that if the girth of such a graph is not $4$ , then either it is a known $2$ -arc-transitive graph or it is isomorphic to one of the following two graphs: $ {\mathrm {K}}_{x[y]}$ , where $x\geq 3,y\geq 2$ , and $G(2,p,({p-1})/{4})$ , where p is a prime and $p \equiv 1 \ (\operatorname {mod}\, 8)$ . Then, as an application of the above result, a complete classification is achieved of the family of $2$ -geodesic-transitive Cayley graphs for dihedral groups.
MSC classification
- Type
- Research Article
- Information
- Journal of the Australian Mathematical Society , Volume 113 , Issue 3 , December 2022 , pp. 386 - 401
- Copyright
- © The Author(s), 2022. Published by Cambridge University Press on behalf of Australian Mathematical Publishing Association Inc.
Footnotes
Communicated by Brian Alspach
Supported by the NNSF of China (12061034,12071484) and NSF of Jiangxi (20212BAB201010,20192ACBL21007,GJJ190273)