On 2-Fold Covers of Graphs

Yan-Quan Feng, Klavdija Kutnar, Aleksander Malnic +1

A regular covering projection $\p\colon \tX \to X$ of connected graphs is $G$-admissible if $G$ lifts along $\p$. Denote by $\tG$ the lifted group, and let $\CT(\p)$ be the group o…