Positive roots in case | |||||||
( ): Case |
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| Changes of sign | Number of positive roots |
1 | − | + | + | + | + | 1 | 1 |
2 | − | + | + | + | + | 1 | 1 |
3 | − | − | − | + | + | 1 | 1 |
4 | − | − | − | − | + | 1 | 1 |
5 | − | + | + | − | + | 3 | 1, 3 |
6 | − | + | − | + | + | 3 | 1, 3 |
7 | − | + | − | − | + | 3 | 1, 3 |
8 | − | − | + | − | + | 3 | 1, 3 |