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ARY 1995 123 NUMBE UMBER428 PROCEEDINGS JL OFTHE AMERICAN MATHEMATICAL SOCIETY EDITED BY William Adams Dale Alspach J. Marshall Ash Albert Baernstein II Eric Bedford Andreas R. Blass Christopher Croke Richard T. Durrett Clifford J. Earle Jr. Eric Friedlander Theodore W. Gamelin James Glimm Ken Goodearl Roe Goodman Thomas Goodwillie Dennis A. Hejhal Palle E. T. Jorgensen Jeffry N. Kahn Linda Keen Irwin Kra, Managing Editor Peter Li Wei Y. Loh Joseph S. B. Mitchell M. Susan Montgomery Jeffrey B. Rauch Mary Rees David Sharp Lance W. Small Hal L. Smith Christopher D. Sogge Ronald M. Solomon Ronald Stern Franklin D. Tall John Trangenstein Wolmer V. Vasconcelos James West PROVIDENCE, RHODE ISLAND USA ISSN 0002-9939

Proceedings of the American Mathematical Society This journal is devoted entirely to research in pure and applied mathematics. Subscription information. Proceedings of the American Mathematical Society is published monthly. Subscription prices for Volume 123 (1995) are $605 list; $484 institutional member; $363 individual member. A late charge of 10% of the subscription price will be imposed upon orders received from nonmembers after January 1 of the subscription year. Subscribers outside the United States and India must pay a postage surcharge of $25; subscribers in India must pay a postage surcharge of $38. Expedited delivery to destinations in North America $38; elsewhere $91. Back number information. For back issues see the AMS Catalog of Publications. Subscriptions and orders should be addressed to the American Mathematical Society, P. O. Box 5904, Boston, MA 02206-5904. All orders must be accompanied by payment. Other correspondence should be addressed to P.O. Box 6248, Providence, RI 02940-6248. Copying and reprinting. Individual readers of this publication, and nonprofit libraries acting for them, are permitted to make fair use of the material, such as to copy an article for use in teaching or research. Permission is granted to quote brief passages from this publication in reviews provided the customary acknowledgement of the source is given. Republication, systematic copying, or multiple reproduction of any material in this publication (including abstracts) is permitted only under license from the American Mathematical Society. Requests for such permission should be addressed to the Manager of Editorial Services, American Mathematical Society, P. O. Box 6248, Providence, RI 02940-6248. Requests can also be made by e-mail to reprint-permission math.ams.org. The appearance of the code on the first page of an article in this journal indicates the copyright owner's consent for copying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law, provided that a fee of $1.00 plus $.25 per page for each copy be paid directly to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923. This consent does not extend to other kinds of copying, such as copying for general distribution, for advertising or promotion purposes, for creating new collective works, or for resale. Proceedings of the American Mathematical Society is published monthly by the American Mathematical Society at 201 Charles Street, Providence, RI 02904-2213. Secondclass postage is paid at Providence, Rhode Island. Postmaster: Send address changes to Proceedings, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248. Copyright 1994 by the American Mathematical Society. All rights reserved. Printed in the United States of America. The paper used in this journal is acid-free and falls within the guidelines established to ensure permanence and durability. ô Printed on recycled paper. This publication was typeset using A\iS-T^X, the American Mathematical Society's TpX macro system. 10 9 8 7 6 5 4 3 2 1 99 98 97 96 95 94

Editorial Information To be published in the Proceedings, a paper must be correct, new, nontrivial, and significant. Further, it must be well written and of interest to a substantial number of mathematicians. Piecemeal results, such as an inconclusive step toward an unproved major theorem or a minor variation on a known result, are in general not acceptable for publication. Proceedings Editors solicit and encourage publication of worthy papers of length not exceeding 10 published pages. Published pages are the same size as those generated in the style files provided for A\aS-T^X or.äa/f<s-iatr X. Very short notes not to exceed two printed pages are also accepted, and appear under the heading Shorter Notes. Items deemed suitable include an elegant new proof of an important and well-known theorem, an illuminating example or counterexample, or a new viewpoint on familiar results. New results, if of a brief and striking character, might also be acceptable, though in general a paper which is merely very short will not be suitable for the Shorter Notes department. As of November 1, 1994, the backlog for this journal was approximately 9 issues. This estimate is the result of dividing the number of manuscripts for this journal in the Providence office that have not yet gone to the printer on the above date by the average number of articles per issue over the previous twelve months, reduced by the number of issues published in four months (the time necessary for editing and composing a typical issue). A Copyright Transfer Agreement is required before a paper will be published in this journal. By submitting a paper to this journal, authors certify that the manuscript has not been submitted to nor is it under consideration for publication by another journal, conference proceedings, or similar publication. Information for Authors and Editors The first page of an article must consist of a descriptive title, followed by an abstract that summarizes the article in language suitable for workers in the general field (algebra, analysis, etc.). The descriptive title should be short, but informative; useless or vague phrases such as "some remarks about" or "concerning" should be avoided. The abstract should be at least one complete sentence, and at most 150 words. Included with the footnotes to the paper, there should be the 1991 Mathematics Subject Classification representing the primary and secondary subjects of the article. This may be followed by a list of key words and phrases describing the subject matter of the article and taken from it. A list of the numbers may be found in the annual index of Mathematical Reviews, published with the December issue starting in 1990, as well as from the electronic service e-math [telnet e-math.ams.org (or telnet 130.44.1.100). Login and password are e-math]. For journal abbreviations used in bibliographies, see the list of serials in the latest Mathematical Reviews annual index. When the manuscript is submitted, authors should supply the editor with electronic addresses if available. These will be printed after the postal address at the end of each article. Two copies of the paper should be sent directly to the appropriate Editor and the author should keep one copy. TgX files available upon request. Authors may request a copy of the TrfX files of their papers by sending e-mail to file-request@math.ams.org or by contacting the Editorial Department, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248. The request should include the title of the paper, the name(s) of the author(s), the name of the publication in which the paper has or will appear, and the volume and issue numbers if known. The TgX file will be sent to the author making the request after the article goes to the printer. If the requestor can receive Internet e-mail, please include the e-mail address to which the file should be sent. Otherwise please indicate a diskette format and postal address to which a disk should be mailed. NOTE: Because

TeX production at the AMS sometimes requires extra fonts and macros that are not yet publicly available, TpX files cannot be guaranteed to run through the author's version of T^X without errors. The AMS regrets that it cannot provide support to eliminate such errors in the author's TgX environment. Electronically prepared manuscripts. The AMS encourages submission of electronically prepared manuscripts in AmS-T^K or AmS-WT^K because properly prepared electronic manuscripts save the author proofreading time and move more quickly through the production process. To this end, the Society has prepared "preprint" style files, specifically the amsppt style of 4M<S-Tr X and the amsart style of A^S-le^K, which will simplify the work of authors and of the production staff. Those authors who make use of these style files from the beginning of the writing process will further reduce their own effort. Electronically submitted manuscripts prepared in plain TgX or IATjX do not mesh properly with the AMS production systems and cannot, therefore, realize the same kind of expedited processing. Users of plain TjX should have little difficulty learning A^/fS-T^X., and IATpX users will find that AmS-WT^K is the same as IATpX with additional commands to simplify the typesetting of mathematics. Guidelines for Preparing Electronic Manuscripts provides additional assistance and is available for use with either A^S-T^X. or AmS-I&TçX.. Authors with FTP access may obtain Guidelines from the Society's Internet node e-math. ams. org (130.44.1.100). For those without FTP access Guidelines can be obtained free of charge from the e-mail address guide-elecqmath. ams. org (Internet) or from the Customer Services Department, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248. When requesting Guidelines, please specify which version you want. At the time of submission, authors should indicate if the paper has been prepared using ^vt<s-tpx or Aj\aS-WT^X.. The Manual for Authors of Mathematical Papers should be consulted for symbols and style conventions. The Manual may be obtained free of charge from the e-mail address cust-serv math.ams.org or from the Customer Services Department, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248. The Providence office should be supplied with a manuscript that corresponds to the electronic file being submitted. Electronic manuscripts should be sent to the Providence office immediately after the paper has been accepted for publication. They can be sent via e-mail to pubsubmitqmath.ams.org (Internet) or on diskettes to the Publications Department, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248. When submitting electronic manuscripts please be sure to include a message indicating in which publication the paper has been accepted. No corrections will be accepted electronically. Authors must mark their changes on their proof copies and return them to the Providence office. Authors and editors are encouraged to make the necessary submissions of electronically prepared manuscripts and proof copies in a timely fashion. Any inquiries concerning a paper that has been accepted for publication should be sent directly to the Editorial Department, American Mathematical Society, P.O. Box 6248, Providence, RI 02940-6248.

Editors Authors are requested to send papers directly to the appropriate Editor (the one whose area of responsibility and expertise, as described below, most closely approximates the subject field of the manuscript). Only when in doubt about an appropriate Editor, should manuscripts be sent to the Coordinating Editor responsible for the area in mathematics most closely connected to the paper. If in doubt about the area, send manuscript to the Managing Editor, to whom all other communication about the journal should also be addressed. (All addresses should include the line "Department of Mathematics", unless another department is indicated.) Managing Editor: Irwin Kra, SUNY at Stony Brook, Stony Brook, NY 11794-3651 e-mail: irwinsmath. sunysb. edu 1. ODE, PDE, GLOBAL ANALYSIS, AND DYNAMICAL SYSTEMS Coordinating Editor: Linda Keen, CUNY-Lehman College, Bronx, NY 10468, e-mail: ljklcacunyvm.cuny.edu or ljklcscunyvm.bitnet Partial differential equations, Jeffrey B. Rauch, University of Michigan, Angell Hall, Ann Arbor, MI 48109-0001, e-mail: rauchomath.lsa.umich.edu Dynamical systems and ergodic theory, Mary Rees, Department of Pure Mathematics, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, United Kingdom, e-mail: maryreesqliverpool.ac.uk Ordinary differential equations and special functions, Hal L. Smith, Arizona State University, Tempe, AZ 85287, e-mail: halsmithsmath.la.asu.edu Global analysis, Linda Keen 2. LIE GROUPS, TOPOLOGY, AND GEOMETRY Coordinating Editor: Peter Li, University of California, Irvine, CA 92717, e-mail: plismath.uci.edu Topological groups and Lie groups (symmetric spaces), Roe Goodman, Rutgers University, New Brunswick, NJ 08903, e-mail: goodmansmath.rutgers.edu Riemannian geometry (including affine, pseudo-riemannian, contact, classical, and Lorentzian geometries), Christopher Croke, University of Pennsylvania, Philadelphia, PA 19104, e-mail: ccrokesmath. upenn. edu Geometric analysis (geometric PDE, minimal surfaces, harmonic maps) and Kahler geometry, Peter Li Algebraic topology (higher dimensional topology), Thomas Goodwillie, Brown University, Box 1917, Providence, RI 02912, e-mail: tomgsbrownvm.bitnet Metric and geometric topology, James West, Cornell University, White Hall, Ithaca, NY 14853 7901, e-mail: westsmath.cornell.edu Set-theoretic and general topology, Franklin D. Tall, University of Toronto, Toronto, Ontario, Canada M5S 1A1, e-mail: tallsmath.toronto.edu Low dimensional topology and differential topology (knot theory, 3- and 4-manifolds, Gaugetheory), Ronald Stern, University of California, Irvine, CA 92717, e-mail: rsternsmath.uci.edu 3. ANALYSIS AND OPERATOR THEORY Coordinating Editor: Clifford J. Earle, Jr., Cornell University, White Hall, Ithaca, NY 14853, e-mail: cliffsmath.cornell.edu One complex variable and potential theory, Albert Baernstein II, Washington University, St. Louis, MO 63130, e-mail: C31801ABSWUVMD.BITNET Several complex variables, Eric Bedford, Indiana University, Swain Hall East, Bloomington, IN 47401, e-mail: BEDFORDSucs.indiana.edu Functional analysis, Dale Alspach, Oklahoma State University, Stillwater, OK 74078, e-mail: alspachshilbert.math.okstate. edu Complex variables, functional analysis, and operator theory, Theodore W. Gamelin, University of California, Los Angeles, CA 90024, e-mail: twgsmath.ucla.edu Functional analysis and operator theory, Palle E. T. Jorgensen, University of Iowa, Iowa City, IA 52242 Classical and harmonic analysis, J. Marshall Ash, DePaul University, Chicago, IL 60614, e-mail: MATJMAQDEPAUL.BITNET

Classical and harmonic analysis, Christopher D. Sogge, UCLA, Los Angeles, CA 90024, e-mail: soggeqmath.ucla.edu Analytic number theory and automorphic forms, Dennis A. Hejhal, School of Mathematics, University of Minnesota, Minneapolis, MN 55455, e-mail: hejhalsmath.umn.edu 4. ALGEBRA, NUMBER THEORY, AND COMBINATORICS Coordinating Editor: M. Susan Montgomery, University of Southern California, DRB 155, Los Angeles, CA 90089-1113, e-mail: smontgomsmath.usc.edu General number theory, William Adams, University of Maryland, College Park, MD 20742, e-mail: wwaqmath.umd.edu General algebra, Lance W. Small, University of California San Diego, La Jolla, CA 92093-0112, e-mail: lwsmallsucsd.edu Commutative algebra, Wolmer V. Vasconcelos, Rutgers University, New Brunswick, NJ 08903, e-mail: vasconcesrings. rutgers. edu Group theory, Ronald M. Solomon, Ohio State University, Columbus, OH 43210, e-mail: solomonsfunction.mps.ohio-state. edu A>theory, algebraic groups, algebraic geometry, Eric Friedlander, Northwestern University, Evanston, IL 60208, e-mail: ericsmath.nwu.edu Combinatorics, Jeffry N. Kahn, Rutgers University, New Brunswick, NJ 08903, e-mail: j kahnsmath. rutgers. edu Analytic number theory and automorphic forms, Dennis A. Hejhal, School of Mathematics, University of Minnesota, Minneapolis, MN 55455, e-mail: hejhalsmath.umn.edu Logic and foundations, Andreas R. Blass, University of Michigan, Ann Arbor, MI 48109-1003, e-mail: ablasssumich.edu Lie algebras and Lie groups, Roe Goodman, Rutgers University, New Brunswick, NJ 08903, e-mail: goodmansmath. rutgers. edu Noncommutative rings, Ken Goodearl, University of California, Santa Barbara, CA 93106, e-mail: goodearlsmath.ucsb.edu 5. APPLIED MATHEMATICS, PROBABILITY, AND STATISTICS Coordinating Editor : James Glimm, Department of Applied Mathematics and Statistics, SUNY at Stony Brook, Stony Brook, NY 11794-3600, e-mail: glimmsams. sunysb. edu Probability, Richard T. Durrett, Cornell University, White Hall, Ithaca, NY 14853-7901, e-mail: rtdscornella.cit.cornell.edu Statistics, Wei Y. Loh, Department of Statistics, University of Wisconsin, 1210 W. Dayton Street, Madison, WI 53706, e-mail: lohsstat.wisc.edu Applied mathematics, David Sharp, Theoretic Division, Los Alamos National Laboratory MSB285, Los Alamos, NM 87545, e-mail: dhsslanl.gov John Trangenstein, Duke University, Durham, NC 27706, e-mail: johntsmath.duke.edu Operations research, Joseph S. B. Mitchell, Department of Applied Mathematics and Statistics, SUNY at Stony Brook, Stony Brook, NY 11794-3600, e-mail: j sbmsams. sunysb. edu

(Continued from back cover) F. STATISTICS AND PROBABILITY Jeffrey S. Rosenthal, On duality of probabilities for card dealing. 559 Xuming He and Gang Wang, Law of the iterated logarithm and invariance principle for M- estimators. 563 Qi-Man Shao, On a conjecture of Révész. 575 G. TOPOLOGY Huaipeng Chen, An answer to a conjecture on the countable products of fc-spaces. 583 James W. Anderson, Parabolics on the boundary of the deformation space of a Kleinian group. 589 Daniel Ruberman, Involutions on spin 4-manifolds. 593 M. H. Eggar, On compositions of the loop and suspension functors. 597 Paolo Lisca, A vanishing theorem for Donaldson invariants. 607 Xiu-Chi Quan, Positive definite functions of Hopf C*-algebras. 615 Judith H. Silverman, Hit polynomials and the canonical antiautomorphism of the Steenrod algebra. 627 Lizhen Ji, Convergence of heat kernels for degenerating hyperbolic surfaces. 639

PROCEEDINGS OF THE AMERICAN MATHEMATICALSOCIETY CONTENTS Vol. 123, No. 2 Whole No. 428 February 1995 A. ALGEBRA, NUMBER THEORY, AND COMBINATORICS Ying-Sheng Liu, A counterexample to the deformation conjecture for uniform tree lattices Le Maohua, On the diophantine equation 2" + px2 = yp. D. S. Passman and Declan Quinn, Burnside's theorem for Hopf algebras. Daniel K. Nakano, A bound on the complexity for GrT modules. Jie-Tai Yu, A product formula for minimal polynomials and degree bounds for inverses of polynomial automorphisms. Randall R. Holmes, A duality proof of a theorem of P. Hill. Marcelo Laca and Iain Raeburn, Extending multipliers from semigroups. David A. Clark, An upper bound of ) l/(a,-loga,-) for primitive sequences. 315 321 327 335 343 351 355 363 B. ANALYSIS A. Volberg, R. Younis, and D. Zheng, Subalgebras of C(M(H )). 367 Yifei Pan, Real analyticity of homeomorphic CR mappings between real analytic hypersur- faces in C2. 373 Jorma Arhippainen, On the ideal structure of algebras of star-algebra valued functions... Wojciech Chojnacki, A note on complete integrals. Shusheng Fu, An extension of the Foran integral. Gun-Marie Lövblom, Uniform homeomorphisms between the unit balls in Lp and lp... Bertram Yood, Banach algebras with non-hausdorff structure spaces. Claudio H. Morales and Simba A. Mutangadura, On the approximation of fixed points for locally pseudo-contractive mappings. Stephen D. Abbott, A unified approach to some prediction problems. J. García-Cuerva and K. S. Razarían, Spline wavelet bases of weighted LP spaces, 1 < p < oo Martin Chuaqui, A unified approach to univalence criteria in the unit disc. Charles Swartz, Subseries convergence in spaces with a Schauder basis. Jürgen Bliedtner and Peter A. Loeb, Best filters for the general Fatou Boundary Limit Theorem. Michal Feckan, Periodic solutions of certain abstract wave equations. Lea McClaran, Banach spaces with an unconditional basis that are isomorphic to a nonatomic Banach lattice. 381 393 403 405 411 417 425 433 441 455 459 465 471 M. Meyer, G. Mokobodzki, and M. Rogalski, Convex bodies and concave functions. Mirostew Baran, Complex equilibrium measure and Bernstein type theorems for compact sets in R". 477 485 Hiroshi Haruki and Themistocles M. Rassias, New generalizations of Jensen's functional equation. Carolyn Eoff, The discrete nature of the Paley-Wiener spaces. Jacqueline Fleckinger and Michel L. Lapidus, Indefinite elliptic boundary value problems on irregular domains. Yasuhiro Sasahara and Kazunaga Tanaka, A remark on positive radial solutions of the elliptic equation Am+ K{\x\)u(n+2W"-21 = 0 in R". W. Allegretto and P. O. Odiobala, Nonpositone elliptic problems in R". Lance Bamett, Free product von Neumann algebras of type III. 495 505 513 527 533 543 E. LOGIC AND FOUNDATIONS Rostas Skandalis, diophantine On the characterization. 0002-99391199502)123:2;1-0 of recursively enumerable sets as pseudo- 555 on inside back cover) (Continued