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arXiv 1208.4734math.CO
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图的$k$ -独立数的新求法

New approach to the $k$-independence number of a graph

Yair Caro, Adriana Hansberg

摘要:

设$G = (V,E)$是一个图,$k \ge 0$是一个整数。$k$无关集$S \subseteq V$是一组顶点,使得由$S$导出的图中的最大度至多为$k$ .我们用$α_k(G)$表示$G$的$k$独立集的最大基数。我们证明了,对于一个图$G$上的$n$顶点和平均度$d$,$α_k(G) \ge \frac{k+1}{\lceil d \rceil + k + 1} n$,改进迄今为止最好的一般下界由于Caro和Tuza [改进下界k-独立性,J.图论15(1991),99-107]。

英文摘要:

Let $G = (V,E)$ be a graph and $k \ge 0$ an integer. A $k$-independent set $S \subseteq V$ is a set of vertices such that the maximum degree in the graph induced by $S$ is at most $k$. With $α_k(G)$ we denote the maximum cardinality of a $k$-independent set of $G$. We prove that, for a graph $G$ on $n$ vertices and average degree $d$, $α_k(G) \ge \frac{k+1}{\lceil d \rceil + k + 1} n$, improving the hitherto best general lower bound due to Caro and Tuza [Improved lower bounds on k-independence, J. Graph Theory 15 (1991), 99-107].

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