Published online by Cambridge University Press: 15 September 2022
Let $\Gamma $ be a graph of valency at least four whose automorphism group contains a minimally vertex-transitive subgroup G. It is proved that $\Gamma $ admits a nowhere-zero $3$ -flow if one of the following two conditions holds: (i) $\Gamma $ is of order twice an odd number and G contains a central involution; (ii) G is a direct product of a $2$ -subgroup and a subgroup of odd order.
The first author was supported by the Basic Research and Frontier Exploration Project of Chongqing (No. cstc2018jcyjAX0010) and the Foundation of Chongqing Normal University (21XLB006).