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The Strong Distance Problems

机译:强距离问题

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摘要

Suppose G = (V,E) is a graph and D = (V,F) is a strong oriented graph of G. Let u,v ∈ V, the strong distance sd(u,v) is the minimum size of strong subdigraph of D containing u and v, the strong eccentricity se(u) is the maximum strong distance sd(u,v) between u and v for all v ∈ V. The strong radius and strong diameter of D is defined as the minimum and maximum se(u) for all u ∈ V, respectively. And for any graph G, the lower (upper) orientable strong radius srad(G) (SRAD(G)) defined as the minimum (maximum) strong radius srad(D) in all possible strong oriented graph D of G, respectively; the lower (upper) orientable strong diameter sdiam(G) (SDIAM(G)) is the minimum (maximum) strong diameter sdiam(D) in all possible strong oriented graph D of G, respectively. This paper gives some properties for this four values. Then for the Cartesian product GxH of any two graph G and H, we find two inequalities to obtained an upper bound of srad(GxH) and sdiam(GxH). At last, we gives the exact values of srad(G) and sdiam(G) for graph G be the hypercube graph BC_n, the extension hypercube graphs EC_n and FC_n.
机译:假设G =(V,E)是图,而D =(V,F)是G的强取向图。令u,v∈V,强距离sd(u,v)是强子图的最小大小包含u和v的D的强偏心率se(u)是所有v∈V的u和v之间的最大强距离sd(u,v)。D的强半径和强直径定义为最小和最大分别针对所有u∈V的se(u)。对于任何图G,在所有可能的G的强定向图D中,下(上)可定向的强半径srad(G)(SRAD(G))分别定义为最小(最大)最大半径Srad(D);在所有可能的G的强方向图D中,下部(上部)可定向强直径sdiam(G)(SDIAM(G))分别是最小(最大)强径sdiam(D)。本文提供了这四个值的一些属性。然后,对于任意两个图G和H的笛卡尔积GxH,我们发现两个不等式以获得srad(GxH)和sdiam(GxH)的上限。最后,我们给出图G的srad(G)和sdiam(G)的确切值是超立方体图BC_n,扩展超立方体图EC_n和FC_n。

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