2000 Mathematics Subject Classification. Primar y 00-XX , 97-XX . ISBN 0-8218-3302- 2 ISSN 1047-398 X Copying an d reprinting . Materia l i n thi s boo k ma y b e reproduce d b y an y mean s fo r edu - cational an d scientifi c purpose s withou t fe e o r permissio n wit h th e exceptio n o f reproductio n b y services tha t collec t fee s fo r deliver y o f document s an d provide d tha t th e customar y acknowledg - ment o f th e sourc e i s given . Thi s consen t doe s no t exten d t o othe r kind s o f copyin g fo r genera l distribution, fo r advertisin g o r promotiona l purposes , o r fo r resale . Request s fo r permissio n fo r commercial us e of materia l shoul d b e addresse d t o th e Acquisition s Department , America n Math - ematical Society , 20 1 Charle s Street , Providence , Rhod e Islan d 02904-2294 , USA . Request s ca n also b e mad e b y e-mai l t o reprint-permission@ams.org . Excluded fro m thes e provision s i s material i n article s fo r whic h th e autho r hold s copyright . I n such cases , request s fo r permissio n t o us e or reprin t shoul d b e addresse d directl y t o th e author(s) . (Copyright ownershi p i s indicated i n th e notic e i n th e lowe r right-han d corne r o f th e firs t pag e o f each article. ) © 200 3 b y th e America n Mathematica l Society . Al l right s reserved . The America n Mathematica l Societ y retain s al l right s except thos e grante d t o th e Unite d State s Government . Printed i n th e Unite d State s o f America . @ Th e pape r use d i n thi s boo k i s acid-fre e an d fall s withi n th e guideline s established t o ensur e permanenc e an d durability . Visit th e AM S hom e pag e a t http://www.ams.org / 10 9 8 7 6 5 4 3 2 1 0 8 0 7 0 6 0 5 0 4 0 3
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