Variable degeneracy of planar graphs without chorded 6-cycles

Huihui Fang, Danjun Huang, Tao Wang +1

A cover of a graph $G$ is a graph $H$ with vertex set $V(H)={\bigcup }_{v\in V(G)}{L}_v$, where $L_v=\{v\}\times [s]$, and the edge set $M={\bigcup }_{uv\in E(G)}{M}_{uv}$, wh…