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arXiv 2409.03394math.COcs.DM
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将2-边着色二部图划分为单色圈

Partitioning 2-edge-coloured bipartite graphs into monochromatic cycles

Fabrício Siqueira Benevides, Arthur Lima Quintino, Alexandre Talon

AI总结:

本文研究2-边着色完全平衡二部图划分为单色圈的问题,证明任意2-边着色的 $K_{n,n}$ 至多可划分为4个单色圈,改进了此前14个圈的上界。

摘要:

给定图 $G$ 的边的一个 $r$-边着色,若存在 $p$ 个顶点不相交的单色圈覆盖 $G$ 的所有顶点,则称该图可被划分为 $p$ 个单色圈。在该问题的文献中,一条边和单个顶点都算作一个圈。我们证明,对于完全平衡二部图 $K_{n,n}$ 的边的每一种 $2$-着色,它都可以被划分为至多 4 个单色圈。这类问题最早于 1970 年针对完全图被研究,1983 年 Gyárfás 和 Lehel 针对 $K_{n,n}$ 进行了研究。2014 年,Pokrovskiy 证明对所有 $n$,给定其边的任意 $2$-着色,$K_{n,n}$ 可被划分为至多三个单色路。事实证明,寻找单色圈而不是单色路是一个自然的问题,并且也已对其他图提出。2015 年,Schaudt 和 Stein 证明,对于足够大的 $2$-边着色 $K_{n,n}$,14 个圈是足够的。

英文摘要:

Given an $r$-edge-colouring of the edges of a graph $G$, we say that it can be partitioned into $p$ monochromatic cycles when there exists a set of $p$ vertex-disjoint monochromatic cycles covering all the vertices of $G$. In the literature of this problem, an edge and a single vertex both count as a cycle. We show that for every $2$-colouring of the edges of a complete balanced bipartite graph, $K_{n,n}$, it can be partitioned into at most 4 monochromatic cycles. This type of question was first studied in 1970 for complete graphs and in 1983, by Gyárfás and Lehel, for $K_{n,n}$. In 2014, Pokrovskiy showed for all $n$ that, given any $2$-colouring of its edges, $K_{n,n}$ can be partitioned into at most three monochromatic paths. It turns out that finding monochromatic cycles instead of paths is a natural question that has also been raised for other graphs. In 2015, Schaudt and Stein showed that 14 cycles are sufficient for sufficiently large $2$-edge-coloured $K_{n,n}$.

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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