arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2411.04071math.CO
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同时边着色

Simultaneous edge-colourings

Simona Boyadzhiyska, Richard Lang, Allan Lo, Michael Molloy

AI总结:

本研究推广Vizing定理,针对同时为多个图边着色的问题,给出了渐近最优的颜色数界,解决了相关猜想,并扩展到列表设置。

摘要:

我们研究Vizing定理的一个推广,其目标是用少量颜色同时为图$G_1,\dots,G_k$的边着色。对于小的$k$值以及一个无限的$k$值序列,我们获得了所需颜色数关于最大度$\Delta$的渐近最优界。这渐近地解决了Cabello关于$k=2$的猜想。此外,我们证明$\sqrt k \Delta + o(\Delta)$种颜色总是足够的,随着$k$的增长,这趋向于最优值。我们还证明,当每条边至多出现在$\ell$个图中时,$\ell \Delta + o(\Delta)$种颜色就足够了,这渐近地证实了Cambie的一个猜想。最后,我们的结果推广到列表设置。我们还发现这与Füredi、Kahn和Seymour在1990年代的一个猜想以及一个关于分数匹配的旧问题有密切联系。

英文摘要:

We study a generalisation of Vizing's theorem, where the goal is to simultaneously colour the edges of graphs $G_1,\dots,G_k$ with few colours. We obtain asymptotically optimal bounds for the required number of colours in terms of the maximum degree $Δ$, for small values of $k$ and for an infinite sequence of values of $k$. This asymptotically settles a conjecture of Cabello for $k=2$. Moreover, we show that $\sqrt k Δ+ o(Δ)$ colours always suffice, which tends to the optimal value as $k$ grows. We also show that $\ell Δ+ o(Δ)$ colours are enough when every edge appears in at most $\ell$ of the graphs, which asymptotically confirms a conjecture of Cambie. Finally, our results extend to the list setting. We also find a close connection to a conjecture of Füredi, Kahn, and Seymour from the 1990s and an old problem about fractional matchings.

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。

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