A criterion for the real part positive semidefiniteness matrix is presented, and the algorithm for this criterion is given.
给出了实部半正定矩阵的一种判定方法，并给出了该判定方法的算法。
The real part of the complex pole is the energy of an unstable localized mode, and the reciprocal of the imaginary part is its life-time. Naturally the life-time is positive.
复极点的实部是不稳定局域模的能量，虚部是它寿命的倒数，自然地得到了寿命为正的限制。
The positive part and negative part of the real roots can be used to judge the stability of the system.
由实部根轨迹的负与正可以判定系统的稳定性。
The positive part and negative part of the real roots can be used to judge the stability of the system.
由实部根轨迹的负与正可以判定系统的稳定性。
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