ODE – Autonomous Equations and Stability
Autonomous Equation
is an equation of the special form
x′=f(x)(1) x'=f(x) \qquad (1) x′=f(x)(1)
Note: 可以看出这个方程与函数x(t)x(t)x(t)的自变量ttt无关
Direction field
因为与自变量无关,所以对于任意的t值,v相同处的方向场都是一样的
如下图
Equilibrium Points and Solutions
If f(x0)=0f(x_0)=0f(x0)=0, then the constant function x(t)=x0x(t)=x_0x(t)=x0 satisfies