~ ?yvD ?Dy
ê?
￥+?¨ (B )
?f
￥ p?E5
???
~ ?yvD ?Dy
0),(.1 =yxF
BaB?Z?￥ f?
?f
i? ?
!f
),( yxF ? ),(
00
yxP ￥
B
#×
= μ ??￥
ê?
 O 0),(
00
=yxF 
0),(
00
≠yxF
y
5Z? 0),( =yxF ? ),(
00
yxP ￥
B
#×
=
·B ??B??′ ?? O μ ??
?
￥f
)(xfy = 
@Hq )(
00
xfy = i
μ
y
x
F
F
dx
dy
= 
?f
￥ p?
T
~ ?yvD ?Dy
è  ￡Z? 01
22
=?+ yx ? )1,0( ￥

#
×
=
·B ??B??′ V?a O 0=x
H 1=y
￥?f
)(xfy = i p?f
￥B¨=¨?
 0=x ￥′,
3
7 1),(
22
+= yxyxF
5
,2xF
x
=
,2yF
y
=
,0)1,0( =F
,02)1,0( ≠=
y
F
G? ??Z? 01
22
=?+ yx ? )1,0( ￥

#×
=
·B ??B??′ V?a O 0=x
H 1=y ￥
f
)(xfy = 
~ ?yvD ?Dy
f
￥B¨=¨?
1
y
x
F
F
dx
dy
=
,
y
x
=
,0
0
=
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22
2
y
yxy
dx
yd
′
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2
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x
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=
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1
3
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0
2
2
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yd
~ ?yvD ?Dy
è X?
x
y
yx arctanln
22
=+  p
dx
dy
,
3
7
5
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22
x
y
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,),(
22
yx
yx
yxF
x
+
+
=,),(
22
yx
xy
yxF
y
+
=
y
x
F
F
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dy
=
.
xy
yx
+
=
~ ?yvD ?Dy
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i? ? 
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),,( zyxF ?,(
0
xP ),
00
zy 
￥
B
#×
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ê?
 O,(
0
xF 0),
00
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0),,(
000
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z
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),,(
000
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B
#×
=
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ê?
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@Hq
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000
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iμ
z
x
F
F
x
z
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z
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F
y
z
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~ ?yvD ?Dy
è
! 04
222
=?++ zzyx  p
2
2
x
z
,
3
7
5
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222
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x
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,
2 z
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x
z
z
x
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2
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z
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z
x
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z
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.
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3
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x
z

y
x

z
y
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±
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ü z A? yx,￥f
 x p
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z

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 z p
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z
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=
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z
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z
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ü
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+
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0),,(
0),,(
=
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0
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0
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xz
xz
zy
zy
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222
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ü
Z?,
3 °¤ ?¨
T ;
3 |
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=+
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dx
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,
zy
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dx
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 },1,0,1{?=T
r
p MLZ?1
,
1
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0
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=
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=
dx
dz
~ ?yvD ?Dy

s[/+? f ?1a?f
￥ p?E5
0),()1( =yxF
0),,()2( =zyxF
=
=
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0),,,(
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vuyxF
1al2
a bW wL￥ MLDE
ü

s[/+? f ?
,
)(
)(
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=
=
xz
xy
ψ
φ
,
0),,(
0),,(
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~ ?yvD ?Dy
X? )(
z
y
z
x
=  1 V±f

p?=
+
y
z
y
x
z
x
± I5
~ ?yvD ?Dy
± I53s
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z
y
z
x
zyxF=,
5
z
F
x
1
= 
,
1
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y
′
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22
z
y
z
y
z
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z
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z
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z
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y
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y
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z
y
′
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^ z
y
z
y
x
z
x =
+
.
~ ?yvD ?Dy
BaA b5
a
!
x
y
yx arctanln
22
=+
5
 =
dx
dy
@@@@@@@@@@@@@@@@@@@@@@@@@@@
a
!
zx
yz =
5
 =
x
z
@@@@@@@@@@@@@@@@@@@@@@@@@@@

 =
y
z
@@@@@@@@@@@@@@@@@@@@@@@@@@@
=a
!,32)32sin(2 zyxzyx?+=?+ 
￡
ü,1=
+
y
z
x
z

5B
~ ?yvD ?Dy
~z  ?Tf
),,( zyxf  ? t
@1"
T
),,(),,( zyxfttztytxf
k
=
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kQ
Qf

k￡ kQ
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z
f
z
y
f
y
x
f
x =
+
+

1a
!,,3
2
33
yx
z
axyzz

=? p 
?a p?/
Z?F
??￥f
￥?

ê?

a
!
=++
+=
2032
222
22
zyx
yxz

p,,
dx
dz
dx
dy

a
!
=
+=
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),(
2
yvxugv
yvuxfu
 p,,
x
v
x
u


? gf, μB¨ ??
ê?

~ ?yvD ?Dy
áz 
!f
)(xu ?Z?F
=
=
=
0),(
0),,(
),(
zxh
zyxg
yxfu
??

 O,,0,0
dx
du
z
h
y
g
p≠
≠
hgf,, ( V±

?z 
! ),,( txfy = 7 t
^?Z? 0),,( =tyxF
??￥
yx,￥f

p,
dx
dy

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! ),( yxzz = ?Z? ),(
x
z
y
y
x
xF ++ 
??

￡
ü xyz
y
z
y
x
z
x?=
+

~ ?yvD ?Dy
Baa
yx
yx
+
 a
yyxz
zz
zx
x
ln
ln
1

a
yyxz
zy
zx
z
ln
1
1

1a
32
22242
)(
)2(
xyz
yxxyzzz
yx
z

=


?aa
13
,
)13(2
)16(
+
=
+
+?
=
z
x
dx
dz
zy
zx
dx
dy

a
1221
1221
)12)(1(
)12(
gfgyvfx
gfgyvfu
x
u
′
′

′
′
′
′

′′
=


1221
111
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)1(
gfgyvfx
fufxg
x
v
′
′

′
′
′
+
′′
=

5s?
~ ?yvD ?Dy
Ba
zy
xzy
y
xx
x
hg
hgf
g
gf
f
dx
du
′
′
′
′
′
+
′
′
′
′
= 

zy
xzyzxxzyx
hg
hgfhgfhgf
′′
′′′
+
′′′
′′′
= 
ta
tyt
txxt
fFF
fFfF
dx
dy
′
′
+
′
′
′
′
′
=