second-order nonlinear differential equations 二阶非线性微分方程
second-order nonlinear delay differential equations 二阶非线性时滞微分方程
second-order nonlinear functional differential equations 二阶非线性泛函微分方程
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。
The second-order nonlinear differential equations are studied and the existence of the periodic degenerate solution is proved with the principle of the functional analysis.
应用非线性泛函分析的理论和方法研究了一类二阶线性微分方程，证明了周期衰减解的存在性。
The governing equations for the problem is modified into a second-order nonlinear differential system with two infinitesimal parameters and a double parameter multiple scale method is presented.
将该问题的基本方程化为具有两个小参数的二阶非线性方程组，并在双参数摄动法和单参数多重尺度法的基础上提出了双参数多重尺度法。
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