principal diagonal [数] 主对角线 ; 衷角线
principal diagonal polynomial [数] 主对角多项式
dominant principal diagonal matrix 主对角占优矩阵类
principal diagonal line of matrix 矩阵的主对角线
It is proposed a new topological method of adjacent matrix of esters which was constructed by taking the characteristic value of the pieces of ester compounds as principal diagonal element.
提出了拓扑方法，即考虑分子图顶点的性质，直接用酯类化合物的分子碎片的特征值为主元来构建邻接矩阵。
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