对于一元函数来说，如果在该方程中出现因变量的二阶导数，我们就称为二阶（常）微分方程，其一般形式为F(x，y，y'，y'')=0。在有些情况下，可以通过适当的变量代换，把二阶微分方程化成一阶微分方程来求解。
... 二阶椭圆系统 second-order elliptic system 二阶微分 second-order differential 二阶微分方程 second-order differential equation ...
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二阶微分方程组 orderdifferentialsystem
简单二阶微分方程 simple second order differential equation
二阶微分方程式 Second-order Differential Equation
二阶椭圆偏微分方程 Gilbarg and Trudinger ; CM Elliptic partial differential equations of second order
二阶偏微分方程 second order partial differential equation
二阶常微分方程式 Second-Order Linear Differential Equations
二阶积分微分方程 [数] second-order integral differential equation
二阶泛函微分方程 second order functional differential equations
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用泛函的方法研究一类二阶微分方程周期解的存在性。
We studied a class of two order differential equations by means of the functional method.
运用不动点定理，研究了一类带积分边界条件的二阶微分方程三个正解的存在性。
By using fixed point theory, in this paper we study the existence of triple positive solutions for a class of second-order differential equations with integral boundary conditions.
将牵引车的传动系简化为一个2自由度的扭转振动系统，并以二阶微分方程描述。
The driveline for a tractor vehicle is simplified as a 2-DOFs(degree of freedom)torsional vibration system, and is described as a second-order differential equation.
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