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

+

+

+

+

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