常微分分析稳定与不稳定的规律常常不需要求解微分方程，而可以利用微分方程稳定性理论，直接研究平衡状态的稳定性，这里举出一些例子和源码-Ordinary differential analysis of the stable and unstable law does not usually need to solve differential equations, and can take advantage of the stabili