21 downloads
908 Views
457KB Size
Report
This content was uploaded by our users and we assume good faith they have the permission to share this book. If you own the copyright to this book and it is wrongfully on our website, we offer a simple DMCA procedure to remove your content from our site. Start by pressing the button below!
Report copyright / DMCA form
-
$ + >! 4 % ' ( 6
( :3 A; ' (
K
' N / ! N / ! ( )
G
G
1 4 ! I / ! / ! & J K ' 6 K ! K ' N / ! ! ! N / ! ! ! 1 4 !
;
G
/ ! ! / ! ! ! ' 1 4 !
' 1 4 ! M
G ;
;
G
J. Stevens: LNM 1811, pp. 79–92, 2003. c Springer-Verlag Berlin Heidelberg 2003
"$
-% %
+ :3 @ ++!;2 " $ & & "
N / ! ! ! 1 ) + ! 1 4 ! + :3 @ ++B!;2 " & 1 ) ! !
G
G ;
$ >! $ 1 4 ! 4 I % &
G
G
G
6
>! >! R ' > ' ! 4 B :1+ ?; K R
' IN '! ' ' 0 ! ' ! 8 :3 =; 6 I '! ' 6 ' ! 3
:3 @ +C!;!2 ! ! % ! : ;! G
G
G
G
G
G
A
G
G
;
G
G
G
G
G
$
G
G
$ :3 =; ! !
4 "
! ! $ ' G
G
"
A
!
G
"
G
-% %
"
! N !! ! 3 ! 4 " !!! ' $ + :3 @ +=! +@!;2 " $
A!
:
:
G
" :
"
'
( ) ( , "
>!
14!$
+ 1 4 ! ! G
G
G
G
"
G
G
G
;
G
# '
:3 +; :3 =; # I ' K ' K & 4 " $ +! 0 # + * # '
:7+ ++;I " IN ! " '! # ( I + N N ( K = IN %= = ! # I 6 ' ' = ! I # Q N Q $ 4 N ! = ! N ( ( Q N Q ! Q ! Q ! 0 I = ! $ ! N D '
G
"
G
"
-
-
%
"
-
"
"
G
8
"
"
S
" "
-
G
8
-8
8
-
8
-8
8
8
S
-S
S
8
-S
"
-% %
' ' I = ! N ! = 0 I 3
:3 + @?!;2 + > " = 4! = / = > ! 4 = 4! > 8
A
5
S
A
5
8
S
A
"
(
&
=
! ' I ! N 4 ! !! :3 + @B!; I = = I = = # = ! N ! ! ! = ! ( = ! IN $ / = = " > = ! > = !! ! = ! > ) 0
= N > 4 " D 2 ( N N D :3 + @6!; ! IN & I = = ! $ = ! = ! ' :3 = @+?!; :7= =A; $ # + * K N ! Q ! Q ! N ! # N N= N N = 2 I ! N ! ! N > = = ! N = 0 & ( Q Q Q Q Q Q !
N ) = ! N ; : ; : ! G
G
-
@
A
:
G
I
I "
"
" :
A
G
G
G
G
-S
5
A
A
G
5
G
-
-
--
8
-
-
S
-
A
5
:
!! N ! ! !
:=
-5
G
-
-8
G
!
-% %
"
" N ! Q @ = = = "6 = !! ' & N ! 4 + N + + "
" :
"
N Q !
N !
N=
Q @
N # # = !Q = ! Q = !
N = ! + = = = = ! # ( N N N> ' ' $ ( $ # N N N ( I + 1 & 8
-
-
S
8
-
-
S
-
-
S
A
A
T
J
Q
T
J
Q
( Q Q ! Q Q N > J Q Q Q J 1 6 ' 1 Æ @ 0 +++
! 6 6 (
T
T
J
J
Q
Q
T
J
Q
"
-% %
-%
8
( # Q Q N N ! Q Q ! 0 Q Q Q = Q = Q = D 6 ' ( :3 = ++A;I
( ( ' ( ( ' ! ! N ! ! :3 = ++B; ! ! $ :3 A; ( ( ! ( I ( +>+
++,! #
' :3 =; & I = =
T
J
T
J
Q
T
J
Q
"
"
"
"
"
"
"
"
"
% G
G
% G
G
(
G
G
-% %
"'
2 :3 = @+!; I N I = 1 :3 = @A!;2 , G
-
8
G
3B
G
3B
8
G
0 ( 2 ( 14! :3 @ ++=!; 6 + 2 " $ & ( N N >
, ) ( "
>!$ (
14!$ ! 2 6 4 " 2 +++!
Q N> ( ( K
I 6%
N N > " # & 6% 0 ' ! G
3B
G
G
G
"
G
3B
G ;
3B
G
G
3B
M
8
-
M
"
"
"
"
"
46% N
!
=
3B
"
"
!
% Q N Q ! Q ! > N >
-
8
8
8
3B
& N >! ( > = = = > = N = :3 = 7 @?; N > Q ! Q ! Q Q ! Q ! N > >
Q ! # ' 5 I = = = :3 = @B; 0 = N >! ' !
G
.
.
.
.
G
.
3B
7
7
U7
8
U8
-
U
M
UM
U7
#
-#
"
-% %
Q ! N > N > ! Q ! N > 6 =
Q !Q !Q N> G ! N Q ! Q ! I = = 3 :3 + 4 @@?; &I = = ! N = 46% ! ( > 6% ! 46% = 46% ! > ! ! ' :3 = 7 @+> @++; I #
8
-
-M
M
G
7
#
7
7
8
7
7M
-
M 7
"
G
;
12
+ >
"
G ;
"
!! ! = ! > !
! + 2 % $ ! "
6%
:=
G ;
G ;
"
G ;
89
,! 6 & ' G
G
;
+ ! ( +++! =!
9
4 ,! 6 ( # ! ' ! ! N ! ! G
"
"
G ;
12
% G ;
G ;
! % G
;
!
# :3 = ++B;
! ! 7 5 ! N ( N
N K 5 5 Q 5 5 Q 4 5 5 5 5 5 ! Q 5 5 Q 5 5 ! Q Q !
-
R
R
-
M
'
'
"
'
8
R
8
-
8
'
'
8
'
M
-
-
-
-
M
'
8
-
M
-% %
"!
G 4 " 1 4 ! ! & IN ! ) ( :4 "7; # N &! & I '
G
%
%
8
%
%
> > D N + K & N & 4 & N %! ! & & :"7 7 @+A; ) N ! ( :"7 @++; & Q & N > +
%
%
"
%
%
B B
N
%
" "
%
B
%
B
Q
+
4
+
#
K I ! $ N 6 ! ! ' 4 " = 3
:"7 @B;2 + ! ! K ( N = : $J++; ! ! ' ! 6
! ! ' # ) + ! =I ( # N # & (
G
G
Æ
S
Æ
S
8
S
Æ
S
8
8
S
S
S
8
Æ
""
-% %
! N Q D @ N @! + ! = N ! Q ! Q " ) 6% N ! N = ! N ! & ' Q Q Q Q Q Q # & N > ! I & 0 > B # B @! 6 D @ K - ! # ' > ! ! ! = N > & ( Q I
G
Æ
"
Æ
G
-
3
3
3
"
"
:
3
6
6
6
"
6
G
7
"
8
7
8
M
M
G ;
7
8
M
-
-
9 9 9 9 9 $ $ 9 $ 9 9 9 9 9 9 9 9 9 $ 9 : ; : 9 ; : 9 ; 9 : 9 9 ; : 9 9 ; 9 : 9 9 ; : 9 ; 9 : 9 ; : 9 9 ; 9 : 9 ; : 9 ; 9 : 9 ; $ $
$ $
-% %
"#
! # D Q Q Q ! # > Q Q ! ' ( ' ( ' ! Q Q Q ! ( Q ' ! Q Q Q ! ( ' ( Q Q Q ! Q ! Æ # I # ( ( D I
"
7
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
8
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
9
9 9
9
9 9
9
9 9
$ D
( ! % 4 @ # 8 (
& ( ' ' I Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q
(
/
,
1
1
0
(
'
,
'
/
1
0
,
1
0
,
1
1
0
0
,
0
,
#$
-% %
N Q Q Q Q Q ' ' ( = A !D Q Q Q N > 1
'
,
,
(
0
0
1
1
/
1
,
0
0
,
1
0
,
1 , 0
,
0
1
0
1
,
1
,
0
,
0
1
3
3
3
3
( 0 $ '
,
(
1
0
1
/
,
0
" <
< " & % ! ! N @$
$ ,
! ! N @ ! ! =
+ 2
Æ
Æ
Æ
Æ
G
N !D A ( Q
:4; 8 : ?;! ' * & ' .* : $JA; 6 ( I N 0 ' :4; 1 N
E & I N 7 K Q + = +D N N + ( = =! K N Q Q ((( N 7 7 / N + "
"
Æ
-% %
#
+ +! ( N > + 0
N + N + ( N > N + ( 6 4 Q Q Q Q !
! 4
4
4
2
#
,
,
,
,
0 ' I ! ( Q Q Q Q Q N> D )
#
I Q N > # & ' Q Q Q Q Q Q Q Q # ' Q Q Q Q ! Q Q Q Q Q Q Q Q Q Q (
,
,
,
,
-
7
1
1
1
1
1
:
;
3
1 3
3 3
:
3
1
3
3
3
;
1
8
3
1 3
1 3
3
3
1 3
3
3
3
1 3
3
3
' ( & 0 ? / ? ( ? I
8
"
#
-% %
" =
= " & % ! ! N B$
=
=
+
+ 2
Æ
Æ
/ ( ? : ?;