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