Table 4
Equilibrium points stability, 
| x1 | 
| 
| 0 | β | 
| ||
|---|---|---|---|---|---|---|---|
| Det | + | − | − | + | |||
| Tr | − | − | + | + | |||
| Stability | Stable focus/node | Saddle | Saddle | Unstable focus/node |
Equilibrium points stability,
| x1 |
|
| 0 | β |
| ||
|---|---|---|---|---|---|---|---|
| Det | + | − | − | + | |||
| Tr | − | − | + | + | |||
| Stability | Stable focus/node | Saddle | Saddle | Unstable focus/node |