Proper conflict-free list-coloring, odd minors, subdivisions, and layered treewidth
Proper conflict-free list-coloring, odd minors, subdivisions, and layered treewidth
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正确的无冲突列表着色、奇数次要、细分和分层树宽
DOI:
10.1016/j.disc.2023.113668
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发表时间:
2024
影响因子:
0.8
通讯作者:
Liu, Chun-Hung
中科院分区:
文献类型:
--
作者:
Liu, Chun-Hung
Proper conflict-free coloring is an intermediate notion between proper coloring of a graph and proper coloring of its square. It is a proper coloring such that for every non-isolated vertex, there exists a color appearing exactly once in its (open) neighborhood. Typical examples of graphs with large proper conflict-free chromatic number include graphs with large chromatic number and bipartite graphs isomorphic to the 1-subdivision of graphs with large chromatic number. In this paper, we prove two rough converse statements that hold even in the list-coloring setting. The first is for sparse graphs: for every graph H, there exists an integer c H such that every graph with no subdivision of H is (properly) conflict-free c H-choosable. The second applies to dense graphs: every graph with large conflict-free choice number either contains a large complete graph as an odd minor or contains a bipartite induced subgraph that has large conflict-free choice number. These give two incomparable (partial) answers of a question of Caro, Petruševski and Škrekovski. We also prove quantitatively better bounds for minor-closed families, implying some known results about proper conflict-free coloring and odd coloring in the literature. Moreover, we prove that every graph with layered treewidth at most w is (properly) conflict-free (8 w− 1)-choosable. This result applies to (g, k)-planar graphs, which are graphs whose coloring problems have attracted attention recently.
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DOI:
--
发表时间:
2010
期刊:
影响因子:
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作者:
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--
发表时间:
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期刊:
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影响因子:
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影响因子:
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