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:
[email protected] [email protected]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 http://dnb.ddb.de
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