5.2 Example 2. Stable and Unstable limit cycles

These are animations of the system \(\dot{r}=r(1-r^2), \dot{\theta }=1\) which exhibits a stable limit cycle of radius 1.

And animation of the system \(\dot{r}=-r(1-r^2), \dot{\theta }=1\) where the limit cycle now becomes unstable.



Stable limit cycle. \(\dot{r}=r(1-r^2), \dot{\theta }=1\)


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Unstable limit cycle. \(\dot{r}=-r(1-r^2), \dot{\theta }=1\)


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