一个本原不可幂带号有向图S的基指数l(s)是这样的最小正整数l,使得在S中,从任意一点u到任意一点u都有一对长为l的SSSD途径.本文研究了n阶最小奇圈长为r的本原不可幂对称带号有向图的基指数,给出了这类有向图的基指数的最大值.
The base l(S) of a primitive nonpowerfu signed digraph S, is the least integer l such that there exists a pair of SSSD walks of length l from each vertex u to each vertex v in S. In this paper, we study the bases of primitive nonpowerful symmetric signed digraphs of order n with shortest odd cycle length r, and give the largest value of the bases for such digraphs