包含正圈的复符号非异性极小禁用圈链
Minimum forbidden cycle chain for complex sign nonsingularity with positive cycles

研究轴元复符号模式圈链矩阵（即所有元素都是来自{0，±1，±i}，且其伴随有向图中所有圈的邻接结构为一条路的复方阵）的复符号非异性禁用结构，给出两端都是正圈的极小禁用轴元圈链阵的特征刻画.
In this paper，the forbidden structure for complex sign nonsingularity of an axis complex sign pattern cycle chain matrix (i.e.，all entries of the complex matrix are from {0，±1，±i}，and the adjacency structure of all the cycles in its associated digraph is a path) is studied. A characterization is given for the minimum forbidden axis cycle chain matrices whose two ends are positive cycles