Irregularity Strength of Regular Graphs

Irregularity Strength of Regular Graphs
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DOI:
10.37236/806
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发表时间:
2008-06
期刊:
Electron. J. Comb.
影响因子:
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通讯作者:
J. Przybylo
J. Przybylo
中科院分区:
其他
文献类型:
--
作者:
J. Przybylo

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设$G $是一个没有孤立边且至多有一个孤立点的简单图。对于一个正整数$w $,$G $的一个$w $加权是一个映射$f:E(G)\rightarrow\{1,2,\ldots,w\}$。$G $的不规则性强度$s(G)$是最小的$w $使得存在$G $的$w $-加权使得$\sum_{e:u\in e} f(e)\neq\sum_{e:v\in e} f(e)$对于V(G)$中的所有不同顶点对$u,v\。Faudree和莱赫尔的一个猜想说,存在一个常数c使得对每个d $-正则图G $,$d\ge2 $,$s(G)\le {n\over d}+ c $。我们证明了$s(G)
Let $G$ be a simple graph with no isolated edges and at most one isolated vertex. For a positive integer $w$, a $w$-weighting of $G$ is a map $f:E(G)\rightarrow \{1,2,\ldots,w\}$. An irregularity strength of $G$, $s(G)$, is the smallest $w$ such that there is a $w$-weighting of $G$ for which $\sum_{e:u\in e}f(e)\neq\sum_{e:v\in e}f(e)$ for all pairs of different vertices $u,v\in V(G)$. A conjecture by Faudree and Lehel says that there is a constant $c$ such that $s(G)\le{n\over d}+c$ for each $d$-regular graph $G$, $d\ge 2$. We show that $s(G)