Positive roots in case A 0 > 0

R v < 1

( r + u < 1 ):

Case

A 0

A 1

A 2

A 3

A 4

Changes of sign

Number of positive roots

1

+

+

+

+

+

0

0

2

+

+

+

+

+

2

0, 2

3

+

+

+

2

0, 2

4

+

+

2

0, 2

5

+

+

+

+

2

0, 2

6

+

+

+

+

2

0, 2

7

+

+

+

2

0, 2

8

+

+

+

4

0, 2, 4