pure imaginary meaning in English

纯虚数

It shows that any zero must be pure imaginary .
它证明任何的零点必须是纯虚数。
Simplest normal form for singularity with a pure imaginary pair and double zero eigenvalues
双零加一对纯虚根特征值系统的最简规范形
The multiple method of scale is used to obtain the averaged equations in primary parameter resonance . from the averaged equations , the theory of normal form is applied to find the explicit formulas of normal form associated with a double zero and a pair of pure imaginary eigenvalues with the aid of the maple program
利用多尺度方法得出了主参数共振情况下的平均方程，利用normalform理论对具有双零特征值和一对纯虚特征值的平均方程进行了简化，得到了平均系统的normalform 。
The second is to assure a multiple - parameter matrix characteristic equation has no nonzero pure imaginary roots . the key of this part is to verify that the structured singular value of a one - unknown matrix function is not equal to one . this work can be accomplished by a frequency sweeping test method
前者的核心是判定某常矩阵的结构奇异值不等于1 ，这只需计算常矩阵的结构奇异值；后者的核心是判定某个以频率为变元的矩阵的结构奇异值不等于1 ，这一问题由频率扫描测试法解决。