42%.$3 ). -!4(%-!4)#3
4RENDS IN -ATHEMATICS IS A SERIES DEVOTED TO THE PUBLICATION OF VOLUMES ARISING FROM CON
FERENCES AND LECTURE SERIES FOCUSING ON A PARTICULAR TOPIC FROM ANY AREA OF MATHEMATICS )TS
AIM IS TO MAKE CURRENT DEVELOPMENTS AVAILABLE TO THE COMMUNITY AS RAPIDLY AS POSSIBLE
WITHOUT COMPROMISE TO QUALITY AND TO ARCHIVE THESE FOR REFERENCE
0ROPOSALS FOR VOLUMES CAN BE SENT TO THE -ATHEMATICS %DITOR AT EITHER
"IRKHËUSER 6ERLAG
0/ "OX
#(
"ASEL
3WITZERLAND
OR
"IRKHËUSER "OSTON )NC
-ASSACHUSETTS !VENUE
#AMBRIDGE
-!
53!
-ATERIAL SUBMITTED FOR PUBLICATION MUST BE SCREENED AND PREPARED AS FOLLOWS
!LL CONTRIBUTIONS SHOULD UNDERGO A REVIEWING PROCESS SIMILAR TO THAT CARRIED OUT BY JOURNALS
AND BE CHECKED FOR CORRECT USE OF LANGUAGE WHICH
AS A RULE
IS %NGLISH !RTICLES WITHOUT
SURVEY PAPERS
HOWEVER
ARE WELCOME
7E EXPECT THE ORGANIZERS TO DELIVER MANUSCRIPTS IN A FORM THAT IS ESSENTIALLY READY FOR DIRECT
REPRODUCTION !NY VERSION OF 4
TeX
%
ONE PARTICULAR DIALECT OF 4
TeX
%
HËUSER
&URTHERMORE
IN ORDER TO GUARANTEE THE TIMELY APPEARANCE OF THE PROCEEDINGS IT IS ESSENTIAL
EACH ARTICLE WILL RECEIVE FREE OFFPRINTS 4O THE PARTICIPANTS OF THE CONGRESS THE BOOK
WILL BE OFFERED AT A SPECIAL RATE
4OPICS IN #OHOMOLOGICAL 3TUDIES
Hyperbolic Problems
OF !LGEBRAIC 6ARIETIES
and
)MPANGA ,ECTURE .OTES
Regularity Questions
0IOTR 0RAGACZ
%DITOR
Mariarosaria Padula
Luisa Zanghirati
Editors
"IRKHËUSER 6ERLAG
"IRKHËUSER 6ERLAG
"ASEL
"OSTON "ERLIN
"ASEL "OSTON "ERLIN
s
s
s
s
Editors:
%DITOR
Mariarosaria Padula
0IOTR 0RAGACZ
Luisa Zanghirati
)NSTITUTE OF -ATHEMATICS OF THE
Dipartimento di Matematica
0OLISH !CADEMY OF 3CIENCES
Università di Ferrara
UL 3NIADECKICH
via Machiavelli, 35
0/ "OX
I-44100 Ferrara
7ARSZAWA
Italy
0OLAND
e-mail:
GOVPL
E
MAIL PPRAGACZ
-
.
.
!
!XX
$XX
%XX
1
3XX
0
+
(
! #)0 CATALOGUE RECORD FOR THIS BOOK IS AVAILABLE FROM THE
,IBRARY OF #ONGRESS
7ASHINGTON $#
53!
"IBLIOGRAPHIC INFORMATION PUBLISHED BY $IE $EUTSCHE "IBLIOTHEK
E DETAILED
BIBLIOGRAPHIC DATA IS AVAILABLE IN THE )NTERNET AT HTTPDNBDDBDE
2000 Mathematical Subject Classification 35; 75
Library of Congress Control Number: 2006935947
Bibliographic information published by Die Deutsche Bibliothek
Die Deutsche Bibliothek lists this publication in the Deutsche Nationalbibliografie; detailed
bibliographic data is available in the Internet at
978-3-7643-7450-1 Birkhäuser Verlag, Basel – Boston – Berlin
)3".
"IRKHËUSER 6ERLAG
"ASEL n "OSTON n "ERLIN
4HIS WORK IS SUBJECT TO COPYRIGHT !LL RIGHTS ARE RESERVED
WHETHER THE WHOLE OR PART OF THE
BANKS &OR ANY KIND OF USE PERMISSION OF THE COPYRIGHT OWNER MUST BE OBTAINED
¥ "IRKHËUSER 6ERLAG
