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On a recolouring version of Hadwiger's conjecture
arXiv - CS - Discrete Mathematics Pub Date : 2021-03-19 , DOI: arxiv-2103.10684
Marthe Bonamy, Marc Heinrich, Clément Legrand-Duchesne, Jonathan Narboni

We prove that for any $\varepsilon>0$, for any large enough $t$, there is a graph $G$ that admits no $K_t$-minor but admits a $(\frac32-\varepsilon)t$-colouring that is "frozen" with respect to Kempe changes, i.e. any two colour classes induce a connected component. This disproves three conjectures of Las Vergnas and Meyniel from 1981.

中文翻译:

在哈德维格猜想的重塑版本上

我们证明对于任何$ \ varepsilon> 0 $,对于任何足够大的$ t $,都有一个图形$ G $不允许$ K_t $ -minor但允许$(\ frac32- \ varepsilon)t $着色相对于Kempe变化,它是“冻结的”,即,任何两个颜色类别都会导致连接的组件。这反驳了1981年拉斯韦格纳斯(Las Vergnas)和迈尼尔(Meyniel)的三个猜想。
更新日期:2021-03-22
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