Asymptotics of the Chromatic Index for Multigraphs

Asymptotics of the Chromatic Index for Multigraphs
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DOI:
10.1006/jctb.1996.0067
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发表时间:
1996-11
期刊:
J. Comb. Theory, Ser. B
影响因子:
--
通讯作者:
J. Kahn
J. Kahn
中科院分区:
其他
文献类型:
--
作者:
J. Kahn

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对于多式(Multigraphg),letd(g)表示最大程度和setFormula],我们表明色度指数是不对称的最大值{d(g),ggr;(g)}。 (1965年),G的分数索引以及此处建立的渐近学是作者的猜想的一部分,该猜想预测了在本证明中特别感兴趣的分数和普通彩色指数的类似一致性。想法和“硬核”分布从分数到普通(整数)颜色。
For a multigraphG, letD(G) denote maximum degree and setformula]We show that the chromatic index??(G) is asymptotically max{D(G),Ggr;(G)}. The latter is, by a theorem of Edmonds (1965), the fractional chromatic index ofG, and the asymptotics established here are part of a conjecture of the author predicting similar agreement of fractional and ordinary chromatic indices for more general hypergraphs. Of particular interest in the present proof is the use of probabilistic ideas and “hard-core” distributions to go from fractional to ordinary (integer) colorings.