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Number of possible positive real roots for cases q = 0, 1.
| A2 | A1 | A0 | range of R0 | no. of possible positive real roots |
|---|---|---|---|---|
| + | * | − | R0 > 1 | 1 |
| + | − | + | R0 < 1 | 0,2 |
| C2 | C1 | C0 | range of R0 | no. of possible positive real roots |
|---|---|---|---|---|
| + | * | − | R0 > 1 | 1 |
| + | − | + | R0 < 1 | 0,2 |
*Shows the possibility of all signs ( + , − , 0).
