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首页> 外文期刊>Journal of Combinatorial Optimization >Probabilistic graph-coloring in bipartite and split graphs
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Probabilistic graph-coloring in bipartite and split graphs

机译:二部图和分裂图的概率图着色

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摘要

We revisit in this paper the stochastic model for minimum graph-coloring introduced in (Murat and Paschos in Discrete Appl. Math. 154:564–586, 2006), and study the underlying combinatorial optimization problem (called probabilistic coloring) in bipartite and split graphs. We show that the obvious 2-coloring of any connected bipartite graph achieves standard-approximation ratio 2, that when vertex-probabilities are constant probabilistic coloring is polynomial and, finally, we propose a polynomial algorithm achieving standard-approximation ratio 8/7. We also handle the case of split graphs. We show that probabilistic coloring is NP-hard, even under identical vertex-probabilities, that it is approximable by a polynomial time standard-approximation schema but existence of a fully a polynomial time standard-approximation schema is impossible, even for identical vertex-probabilities, unless P=NP. We finally study differential-approximation of probabilistic coloring in both bipartite and split graphs.
机译:我们在本文中再次探讨了最小图形着色的随机模型(Murat和Paschos in Discrete Appl。Math。154:564–586,2006),并研究了二分法和拆分法中潜在的组合优化问题(称为概率着色)图。我们表明,任何连通二分图的明显2色均达到标准近似比2,当顶点概率恒定时,概率着色为多项式,最后,我们提出了一种实现标准近似比为8/7的多项式算法。我们还处理分割图的情况。我们表明,即使在相同的顶点概率下,概率着色也是NP-hard的,它可以由多项式时间标准近似方案近似,但是即使对于相同的顶点概率,也不可能存在完全的多项式时间标准近似方案,除非P = NP。我们最终研究了二部图和分裂图中概率色的微分逼近。

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