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arXiv 0907.3705math.CO
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关于用独立集达到所有最大团

On hitting all maximum cliques with an independent set

Landon Rabern

摘要:

我们证明了每个图$G$,其中$ω(G) \geq 3/4(Δ(G) + 1)$,有一个独立集$I$,使得$ω(G - I) < ω(G)$。因此里德猜想的最小反例$G$满足$ω(G) < 3/4(Δ(G) + 1)$,因此也满足$χ(G) > \lceil 7/6ω(G) \rceil$。我们还证明了如果对$G$的每个导出子图$H$都有$χ(H) \leq \max{\lceil 7/6ω(H) \rceil, \lceil \frac{ω(H) + Δ(H) + 1}{2}\rceil}$,则也有$χ(G) \leq \lceil \frac{ω(G) + Δ(G) + 1}{2}\rceil$ .这给出了King等人证明的重图的线图的上界的一般证明。

英文摘要:

We prove that every graph $G$ for which $ω(G) \geq 3/4(Δ(G) + 1)$, has an independent set $I$ such that $ω(G - I) < ω(G)$. It follows that a minimum counterexample $G$ to Reed's conjecture satisfies $ω(G) < 3/4(Δ(G) + 1)$ and hence also $χ(G) > \lceil 7/6ω(G) \rceil$. We also prove that if for every induced subgraph $H$ of $G$ we have $χ(H) \leq \max{\lceil 7/6ω(H) \rceil, \lceil \frac{ω(H) + Δ(H) + 1}{2}\rceil}$, then we also have $χ(G) \leq \lceil \frac{ω(G) + Δ(G) + 1}{2}\rceil$. This gives a generic proof of the upper bound for line graphs of multigraphs proved by King et al.

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