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arXiv 1303.5136math.CO
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当Δ \ge 5时,G^2是(Δ+1)-可选的充分稀疏条件

Sufficient sparseness conditions for G^2 to be (Δ+1)-choosable, when Δ\ge5

Daniel W. Cranston, Riste Škrekovski

摘要:

当一个图的最大平均度(记为$\mad(G)$)足够小时,我们用它的最大度$Δ$来确定图的平方的列表色数$\chil(G^2)$.对于$Δ\ge 6$,如果为$\mad(G)<2+\frac{4Δ-8}{5Δ+2}$,则为$\chil(G^2)=Δ+1$。特别地,如果$G$与周长$g\ge 7+\frac{12}{Δ-2}$共面,则$\chil(G^2)=Δ+1$。在相同的条件下,有$\chil^i(G)=Δ$,其中$\chil^i$是列表内射色数.

英文摘要:

We determine the list chromatic number of the square of a graph $\chil(G^2)$ in terms of its maximum degree $Δ$ when its maximum average degree, denoted $\mad(G)$, is sufficiently small. For $Δ\ge 6$, if $\mad(G)<2+\frac{4Δ-8}{5Δ+2}$, then $\chil(G^2)=Δ+1$. In particular, if $G$ is planar with girth $g\ge 7+\frac{12}{Δ-2}$, then $\chil(G^2)=Δ+1$. Under the same conditions, $\chil^i(G)=Δ$, where $\chil^i$ is the list injective chromatic number.

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