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arXiv 2101.08342math.CO
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关于欧拉图Wiener指标的一个猜想的证明

Proof of a Conjecture on the Wiener Index of Eulerian Graphs

Peter Dankelmann

摘要:

一个连通图的Wiener指数是所有无序顶点对之间的距离之和。一个连通图是欧拉图,如果它的顶点度都是偶数.在[Gutman,Cruz,Rada,Wiener index of Eulerian Graphs,Discrete应用数学132(2014),247-250]中,作者证明了圈是在给定阶的所有Eulerian图中使Wiener index最大化的唯一图。他们还证明了对于$n \geq 26$阶的欧拉图,由$n-2$顶点上的圈和共享一个顶点的三角形组成的图是唯一的具有第二大Wiener指数的欧拉图。已知该猜想对除六个值之外的所有$n\leq 25$都成立。本文证明了这一猜想。

英文摘要:

The Wiener index of a connected graph is the sum of the distances between all unordered pairs of vertices. A connected graph is Eulerian if its vertex degrees are all even. In [Gutman, Cruz, Rada, Wiener index of Eulerian Graphs, Discrete Applied Mathematics 132 (2014), 247-250] the authors proved that the cycle is the unique graph maximising the Wiener index among all Eulerian graphs of given order. They also conjectured that for Eulerian graphs of order $n \geq 26$ the graph consisting of a cycle on $n-2$ vertices and a triangle that share a vertex is the unique Eulerian graph with second largest Wiener index. The conjecture is known to hold for all $n\leq 25$ with exception of six values. In this paper we prove the conjecture.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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