On edge domination numbers of graphs

On edge domination numbers of graphs
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DOI:
10.1016/j.disc.2004.11.008
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发表时间:
2005-05
期刊:
Discret. Math.
影响因子:
--
通讯作者:
Baogen Xu
Baogen Xu
中科院分区:
其他
文献类型:
--
作者:
Baogen Xu

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设γS‘(G)和γss’(G)分别是G的符号边控制数和符号星控制数。证明了2n-4⩾γss‘(G)⩾γS’(G)⩾n-m对所有无孤立点图G成立,其中n=|V(G)|⩾4,m=|E(G)|,并提出了一些问题和猜想.
Let γs′(G) and γss′(G) be the signed edge domination number and signed star domination number of G, respectively. We prove that 2n-4⩾γss′(G)⩾γs′(G)⩾n-m holds for all graphs G without isolated vertices, where n=|V(G)|⩾4 and m=|E(G)|, and pose some problems and conjectures.