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FINITE TWO-DISTANCE-TRANSITIVE DIHEDRANTS

Published online by Cambridge University Press:  26 January 2022

WEI JIN*
Affiliation:
School of Statistics, Jiangxi University of Finance and Economics, Nanchang, Jiangxi330013, P.R. China School of Mathematics and Statistics, HNP-LAMA, Central South University, Changsha, Hunan410075, P.R. China
LI TAN
Affiliation:
School of Statistics, Jiangxi University of Finance and Economics, Nanchang, Jiangxi330013, P.R. China e-mail: [email protected]

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.

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Australian Mathematical Publishing Association Inc.

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Footnotes

Communicated by Brian Alspach

Supported by the NNSF of China (12061034,12071484) and NSF of Jiangxi (20212BAB201010,20192ACBL21007,GJJ190273)

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