arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.08698cs.DMcs.LOmath.CO
收藏

论广义着色数

On the generalized coloring numbers

Sebastian Siebertz

AI总结:

本文综述广义着色数的组合与算法应用及新进展,证明均匀序存在性,并改进排除拓扑子式图上弱着色数等已知界。

摘要:

图 $G$ 的着色数 $\mathrm{col}(G)$ 等于 $G$ 的退化度加一,为衡量 $G$ 的均匀稀疏性提供了一个非常有用的度量。着色数被三类度量加以推广,即广义着色数:它们分别是 $r$-容许数 $\mathrm{adm}_r(G)$、强 $r$-着色数 $\mathrm{col}_r(G)$ 和弱 $r$-着色数 $\mathrm{wcol}_r(G)$,其中 $r$ 是整数参数。广义着色数衡量有界深度子式的边密度,从而为图的稀疏性提供了一种更均匀的度量。它们已在图论中得到许多应用,尤其在 Nešetřil 与 Ossona de Mendez 提出的有界扩张和无处稠密图类理论中发挥关键作用。我们综述广义着色数在组合与算法方面的应用,重点介绍该领域的新进展。我们还给出均匀序存在性的一个简洁证明,并改进了已知界,例如排除拓扑子式的图上弱着色数的界。

英文摘要:

The \emph{coloring number} $\mathrm{col}(G)$ of a graph $G$, which is equal to the \emph{degeneracy} of $G$ plus one, provides a very useful measure for the uniform sparsity of $G$. The coloring number is generalized by three series of measures, the \emph{generalized coloring numbers}. These are the \emph{$r$-admissibility} $\mathrm{adm}_r(G)$, the \emph{strong $r$-coloring number} $\mathrm{col}_r(G)$ and the \emph{weak $r$-coloring number} $\mathrm{wcol}_r(G)$, where $r$ is an integer parameter. The generalized coloring numbers measure the edge density of bounded-depth minors and thereby provide an even more uniform measure of sparsity of graphs. They have found many applications in graph theory and in particular play a key role in the theory of bounded expansion and nowhere dense graph classes introduced by Nešetřil and Ossona de Mendez. We overview combinatorial and algorithmic applications of the generalized coloring numbers, emphasizing new developments in this area. We also present a simple proof for the existence of uniform orders and improve known bounds, e.g., for the weak coloring numbers on graphs with excluded topological minors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑