Complex unit gain bicyclic graphs with rank 2, 3 or 4

Yong Lu, Ligong Wang, Peng Xiao

A $\mathbb{T}$-gain graph is a triple $\Phi =(G,\mathbb{T},\phi )$ consisting of a graph $G=(V,E)$, the circle group $\mathbb{T}=\{z\in C:|z|=1\}$ and a gain function $φ:\overrightarrow{E…