这是用来解常微分方程的原代码，是我自己编的哦。
This is the solution of ordinary differential equations for the original code, is a series of my own Oh.
将求非线性系统输出相关函数的问题，变成解常微分方程的问题。
Thus a problem of solving the output correlation function of nonlinear system is turned into a problem of solving an ordinary differential equation.
用首次积分法，讨论了带奇异边界条件的非线性常微分方程解的存在性、不存在性和唯一性。
By the first integral method, the existence, uniqueness and nonexistence of solutions for some nonlinear ordinary differential equations with singular boundary condition are discussed.
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