In this paper a new oscillation criterion for second order nonlinear differential equations was established.
本文建立了一类带偏差变元的偏微分方程边值问题解的振动准则。
This paper deals with the oscillation of the first order nonlinear neutral type functional differential equation, and obtains sufficient criterion of the equation oscillation.
本文研究一阶非线性中立型泛函微分方程的振动性。得到了该方程振动的充分性判别法则。
Based on the study of the movement of oscillation center, a criterion of determining whether the center of out-of-step will lies in the interior of the generator is proposed.
基于振荡中心漂移的研究，给出了判断失步中心能否落到机组内部的判据。
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