g
o
v
e
r
n
i
n
g
e
q
u
a
t
i
o
n
∂
t
C
=
∂
x
,
x
C
-
v
∂
x
C
-
k
C
i
n
i
t
i
a
l
c
o
n
d
i
t
i
o
n
s
C
(
x
,
0
)
=
C
i
β
x
-
μ
x
b
o
u
n
d
a
r
y
c
o
n
d
i
t
i
o
n
s
C
(
0
,
t
)
=
C
a
+
C
b
-
λ
t
,
∂
x
C
(
∞
,
t
)
=
0
4
.
C
i
0
.
5
C
a
1
.
v
6
.
β
0
.
0
1
C
b
1
.
k
0
.
μ
0
.
λ
0
.