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多扇图中保Wiener指数的树 被引量:2

Trees Preserving Wiener Index in Multi-Fan Graphs
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摘要 Wiener指数W(G)是指一个连通图G中所有顶点之间的距离之和.给定一个连通图G,若存在图G中一个子树T,使得W(G)=W(T),则称T为G的一个保Wiener指数的树.给出了对于满足特定条件的多扇图中具有保Wiener指数的子树,并证明了在多扇图中存在无穷多个这样的子树. The Wiener index W(G) of a connected graph G is the sum of distances among all pairs of vertices of G.Given a connected graph G,if there is a connected subtree T of G such that W(G)=W(T),then T is called a preserve the Wiener index tree of G.Some subtrees which preserve the Wiener index of multi-fan graphs with some specific conditions are given.It is also proved that there exist infinitely many such subtrees in multi-fan graphs.
出处 《晓庄学院自然科学学报》 CAS 北大核心 2012年第1期17-20,共4页 Journal of Natural Science of Hunan Normal University
基金 国家自然科学基金资助项目(11171273) 陕西省自然科学基础研究计划资助项目(SJ08A01)
关键词 WIENER指数 多扇图 距离 Wiener index multi-fan graphs tree distance
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