( 2 ) we give an upper bound for kth generalized primitive exponents of non - primitive digraphs with order n and girth 2 , determine the exponent set of this class digraphs in section 3 , and discuss the extreme cases ( 2 )第3节给出了围长为2的n阶非本原有向图的第k个顶点指数( exp _ d ( k ) )的上界及相应的指数集，讨论了极端情形。
Next during the study of workflow model , we put forward a kind of " event - enabled conditional direction graph " model , analyze its structure collision , explain its merit and give usage advice 接下来本文针对工作流模型进行了研究，我们提出了“带有事件的条件化有向图”模型，分析了此模型的结构冲突，解释了此模型的优点，给出了使用建议。
The properties of binding number are discussed , the value scope of binding number is obtained , and the existence of digraphs with a given binding number is proved . two conjectures on the relationship between binding number and girth are proposed 在此基础上，论文讨论了有向图结合数的性质，得到了结合数的范围并论证了给定结合数的有向图的摘要存在性，提出了关于结合数与围长之间联系的两个猜想
And meantime a - doubly diagonally dominant matrices was studied in detail . the paper points out that as long as we examine the related quantity involved in the circuit of the associated digraph of matrices we may determine whether a matrix is a non - singular m - matrices or not 同时详细研究了-双对角占优矩阵，指出只要对矩阵伴随有向图圈中所涉及到的相关量进行验证即能判别一个矩阵是否为非奇异m -矩阵。
