The phase portraits of system (5) when
α
>
0
and
g
>
0
. (a)
c
<
−
(
2
g
/
3
)
2
g
/
3
α
, (b)
c
=
−
(
2
g
/
3
)
2
g
/
3
α
, (c)
−
(
2
g
/
3
)
2
g
/
3
α
<
c
<
0
, (d) c = 0, (e)
0
<
c
<
(
2
g
/
3
)
2
g
/
3
α
, (f)
c
=
(
2
g
/
3
)
2
g
/
3
α
, and (g)
c
>
(
2
g
/
3
)
2
g
/
3
α
.
|