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Results of local stability analysis under Case 4.
| Symbols of each element in the Jacobian matrix | det J | tr J | Stability | ||||
|---|---|---|---|---|---|---|---|
| a 11 | a 12 | a 21 | a 22 | ||||
| (0,0) | − | 0 | 0 | + | − | Uncertain | Unstable |
| (0,1) | + | 0 | 0 | − | − | Uncertain | Unstable |
| (1,0) | + | 0 | 0 | − | − | Uncertain | Unstable |
| (1,1) | − | 0 | 0 | + | − | Uncertain | Unstable |
