设S是n阶本原不可幂符号不全对称简单图,证明了l(S)≤2n-2,给出了l(S)=2n-2的充要条件,并确定了n阶(n≥6)本原不可幂符号不全对称简单图的基的集合.
Let S be a primitive non-powerful incomplete sign symmetric simple graph of order n.It was proved that l(S)≤2n-2.And the necessary and sufficient condition of S with l(S)= 2n-2 was given.Furthermore,the set of base of primitive non-powerful incomplete sign symmetric simple graphs of order n(n≥6) was determined.