本文研究了边连通度为r的n阶连通图中距离谱半径最小的极图问题,利用组合的方法,确定了K(n-1,r)为唯一的极图,其中K(n-1,r)是由完全图K(n-1)添加一个顶点v以及连接v与K(n-1)中r个顶点的边所构成.上述结论推广了极图理论中的相关结果.
In this paper we study the extremal graphs with minimum distance spectral radius among all connected graphs of order n and edge connectivity r. By using the combinatorial method, we determine that K(n - 1, r) is the unique extremal graph, where K(n - 1, r) is obtained from the complete graph Kn-1 by adding a vertex v together with edges joining v to r vertices of Kn-1. All the above generalize the related results of the extremal graph theory.