Ngày tải lên :
18/10/2013, 03:20
... , x , a
2
2
,
@
@
y , x , a
2
2
1
p
2
exp
,
y , x , a
2
2
=
,
1
2
+
ay , x , a
+
y , x , a
2
2
p:
@
@x
p = p
x
=
y , x , a
p:
@
2
@x
2
p = p
xx
=
@
@x
y ... t
h
log
x
K
+ rT , t+
1
2
2
T ,t
i
,KN
1
p
T , t
h
log
x
K
+ rT , t ,
1
2
2
T , t
i
where
N =
1
p
2
Z
,1
e
,
1
2
x
2
dx =
1
p
2
Z
1
,
e
,
1
2
x
2
dx:
Therefore,
IE
0;
e
,rT ... r ,
1
2
2
u , t
o
; u t:
180
Therefore,
pt
0
;t
1
;x; y dy = IP fX t
1
2 dyg
=
1
y
p
2 t
1
, t
0
exp
,
1
2 t
1
, t
0
2
h
log
y
x
, r ,
1
2
2
t
1
, t
0
i
2
dy:
Using...