利用树的结构给出了X到Y的映射YZ，Sn以及矩阵积和式per（A）的一种计算方法和高效率计算机鼓轮的设计方法。
In this paper the authors give a kind of useful method that the structure of tree is applied in calculating permutation Sn, mapping YZ and permanent per(A) and designing high-efficient computer cam.
计算阻抗矩阵元素时，由于被积函数振荡性很强，收敛慢，难于计算。
The integrand exhibits slowly convergence and highly oscillatory, which leads to difficulties when attempting to evaluate the impedance matrix elements.
给出了自共轭四元数矩阵的弱圈积的特征值的一些不等式。
Some inequalities of eigenvalues for weak cycle products of self-conjugate quaternion matrices are given.
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