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路和路的笛卡尔积的最小和最大定向强半径和强直径
引用本文:黄怡,陈美润.路和路的笛卡尔积的最小和最大定向强半径和强直径[J].新疆大学学报(理工版),2009,26(1):33-37.
作者姓名:黄怡  陈美润
作者单位:黄怡,HUANG Yi(新疆石油学院,新疆,乌鲁木齐,830000);陈美润,CHEN Mei-run(厦门大学数学科学学院,福建,厦门,361005)  
摘    要:强有向图D中任意两个点乱,W的强距离sd(u,V)定义为D中包含u和v的最小有向强子图Duv的大小(弧的数目).D中一点u的强离心率se(u)定义为u到其他顶点的强距离的最大值.强有向图D的强半径srad(D)(相应的强直径sdiam(D))定义为D中所有顶点强离心率的最小值(相应的最大值).无向图G的最小定向强半径sraG(G)(相应的最大定向强半径SRAD(G))定义为D中所有强定向的强半径的最小值(相应的最大值).无向图G的最小定向强直径sdiam(G)(相应的最大定向强直径SDIAM(G))定义为D中所有强定向的强直径的最小值(相应的最大值).本文确定了路和路的笛卡尔积的最小定向强半径srad(Pm×Pn)和强直径的值sdiam(Pm×Pn),给出了最大定向强半径sRAD(Pm×Rn)的界并提出关于最大定向强直径SDIAM(Pm×Pn)的一个猜想.

关 键 词:强距离  最小定向强半径和强直径  最大定向强半径和强直径

Lower and Upper Orientable Strong Radius and Diameter of Cartesian Product of Paths
HUANG Yi,CHEN Mei-run.Lower and Upper Orientable Strong Radius and Diameter of Cartesian Product of Paths[J].Journal of Xinjiang University(Science & Engineering),2009,26(1):33-37.
Authors:HUANG Yi  CHEN Mei-run
Institution:HUANG Yi, CHEN Mei-run (1. Department of Basic Sciences, Xinjiang Petroleum Institute, Urumqi, Xinjiang 830000, China; 2. School of Mathematical Sciences, Xiamen University, Xiamen, Fujian 361005, China)
Abstract:For two vertices u and v in a strong digraph D, the strong distance sd(u,v) between u and v is the minimum size (the number of arcs) of a strong sub-digraph of D containing u and v. For a vertex v of D, the strong eccentricity se(v) is the strong distance between v and a vertex farthest from v. The strong radius srad(D) (resp. strong diameter sdiarn(D)) is the minimum (resp. maximum) strong eccentricity among the vertices of D. The lower (resp. upper) orientable strong radius srad(G) (resp. SRAD(G)) of a graph G is the minimum (resp. maximum) strong radius over all strong orientations of G. The lower (resp. upper) orientable strong diameter sdiarn(G) (resp. SDIAM(G)) of a graph G is the minimum (resp. maximum) strong diameter over all strong orientations of G. In this paper, we determine the lower orientable strong radius and strong diameter of Cartesian product of paths, and give bounds on the upper orientable strong radius and a conjecture of the upper orientable strong diameter of Cartesian product of paths.
Keywords:Strong distance  Lower orientable strong radius and strong diameter  upper orientable strong radius and strong diameter
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