...式(Linear Differential Equation with Higher Order) 变数系数微分方程式 ( Differential Equation with Variable Coefficient ) 拉普拉斯转换(Laplace Transform) ..
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The two conditions of the second order nonlinear differential equation with variable coefficient are given and expounded with examples.
对二阶变系数非线性微分方程的常系数化给出两个使其可积的条件，并举例论证。
It can be applied to solve nonpositive definite or positive definite partial differential equation with arbitrary variable coefficient under arbitrary boundary condition.
它可以求解在任意边界条件下任意变系数正定或非正定偏微分方程。
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