Program of the Sessions New York, New York, November 4–5, 2000

Saturday, November 4 Special Session on Commutative Algebra, I 8:30 AM – 10:50 AM Room 411, International Meeting Registration Affairs Building Organizers: Irena Peeva, Cornell University 7:30 AM – 5:00 PM First Floor, Havemeyer Building Luchezar Avramov, Purdue University 8:30AM Secant Varieties of Segre Varieties and Monomial (6) Ideals. Preliminary report. AMS Exhibit and Book Sale Maria V Catalisano, University of Genoa, Anthony V Geramita*, Univ. of Genoa, Queen’s Univ., and 7:30 AM – 5:00 PM First Floor, Havemeyer Building Alessandro Gimigliano, University of Bologna (959-13-148) Special Session on Differential Algebra and Related 9:00AM Effective results on the homology of powers of a (7) maximal ideal. Topics, I Liana M Sega, Purdue University (959-13-173) n 8:30 AM – 10:50 AM Room 410, International 9:30AM A formula of Solomon-Terao and bundles on P . Affairs Building (8) Mircea Mustata, U/C Berkeley, and Hal Schenck*, Harvard University (959-13-155) Organizers: Li Guo, Rutgers University at Newark 10:00AM De Rham cohomology, Grobner¨ bases and William Keigher, Rutgers University at (9) stratifications. Preliminary report. Newark Uli Walther, Purdue University (959-14-150) William Sit, City College (CUNY) 10:30AM Direct-sum decompositions over local rings. 8:30AM Using Ritt’s characteristic sets to compute the (10) Roger A Wiegand, University of Nebraska (1) normalizers of the intransitive Lie algebras of (959-13-211) vector fields on the plane. Preliminary report. Phyllis Cassidy, Smith College (emerita) (959-12-283) Session for Contributed Papers, I 9:00AM Computing the Galois Group of 0 8:30 AM – 10:25 AM Room 520, Mathematics Building (2) y(3) + ay + by =0,a,b∈C[x]. Preliminary report. Peter H Berman, North Carolina State University 9:00AM Functional Measure for Separable Systems with (959-12-178) (11) Dynamical Activity. 9:30AM Prounipotent Groups in Differential Galois Theory. C.S. Felicitas and M.W. Auslander*, C.F.C.T.E. (3) Andy R Magid, University of Oklahoma Foundation, Inc. (959-22-06) (959-12-157) 9:15AM Compositional Functions of Order N on Assymetric 10:00AM On a Generic Inverse Differential Galois Problem for (12) Fields of Analytic Data. Preliminary report. (4) GLn. C. S. Felicitas*andM. W. Auslander,CFCTE Lourdes Juan, MSRI (959-13-123) Foundation and Gottlieb Library (959-76-243) 10:30AM Model Theory and Differential Algebra. Preliminary 9:30AM The Mystery of Knots - Computer Programming for

(5) report. I (13) Knot Tabulation. David E Marker, University of Illinois at Chicago Charilaos N Aneziris, Stony Brook, New York (959-03-128) (959-57-81)

The time limit for each contributed paper in the sessions is ten minutes. found in Volume 21, Issue 4 of Abstracts of papers presented to the In the Special Sessions the time limit varies from session to session and American Mathematical Society, ordered according to the numbers in within sessions. To maintain the schedule, time limits will be strictly parentheses following the listings. The middle two digits, e.g., 897-20- enforced. 1136, refer to the Mathematical Reviews subject classification assigned For papers with more than one author, an asterisk follows the name of by the individual author. Groups of papers for each subject are listed the author who plans to present the paper at the meeting. chronologically in the Abstracts. The last one to four digits, e.g., 897-20-

Papers flagged with a solid triangle ( I) have been designated by the 1136, refer to the receipt number of the abstract; abstracts are further author as being of possible interest to undergraduate students. sorted by the receipt number within each classification. Abstracts of papers presented in the sessions at this meeting will be

Appendix–16 NOTICES OF THE AMS VOLUME 47, NUMBER 11 New York, NY, Saturday, November 4 – Program of the Sessions

9:45AM Tangential Homoclinic Intersections in Rn. 10:00AM 1) Local fundamental groups and surface

(14) Preliminary report. I (27) classification ( an extension of a theorem of Victoria Rayskin, Boston University (959-37-92) Mumford). 10:15AM Angular Ratio Transference. Preliminary report. Fabrizio ME Catanese, University of Goettingen (959-14-208) I (15) James H Mulberry, AMS (959-51-110) 10:25AM Period doubling in the Tangent Family. Preliminary (28) report. Special Session on Arrangements of Hyperplanes, I Linda Keen*, CUNY Lehman and Graduate Center, and Janina Kotus, Institute of Mathematics, 8:40 AM – 10:50 AM Room 207, Mathematics Building Technical Univerity of Warsaw (959-37-170) Organizers: Michael J. Falk, Northern Arizona University Special Session on Algebraic Geometry, I

Alexander I. Suciu, Northeastern 9:00 AM – 10:50 AM Room 417, Mathematics Building University 8:40AM Triples of arrangements and local systems. Organizers: Sorin Popescu, Columbia University (16) Daniel C Cohen, Louisiana State University Lev A. Borisov, Columbia University (959-52-182) 9:00AM Hurwitz numbers and Hodge integrals. Preliminary 9:15AM Incidence combinatorics of model constructions. (29) report. (17) Eva-Maria E Feichtner*, ETH Zurich, and Dmitry N Tom Graber*, Harvard, and Ravi Vakil,MIT Kozlov, Royal Institute of Technology, Stockholm, (959-14-247) Sweden (959-06-252) 9:30AM Hurwitz numbers and the tautological ring of the 9:50AM The cohomology rings of complements of subspace (30) moduli space of curves. (18) arrangements. Ravi Vakil*, M.I.T., and Tom Graber, Harvard Mark de Longueville*, University of Minnesota, and (959-14-169) Carsten A Schultz, Freie Universitaet Berlin 10:00AM Localization and Gromov-Witten theory. (959-52-104) (31) Rahul V. Pandharipande, Caltech (959-14-279) 10:25AM Equivariant Euler characteristics of braid 10:30AM Hyperquot schemes and rational curves on flag (19) arrangements. Preliminary report. (32) varieties. Graham C Denham*andNicole M Lemire, Linda Chen, Columbia University (959-14-276) University of Oregon (959-20-275) Special Session on Nonlinear Partial Differential Special Session on the Topology of 3-Manifolds, I Equations, I 9:00 AM – 10:50 AM Room 403, International 9:00 AM – 10:50 AM Room 312, Mathematics Building Affairs Building Organizers: Joan S. Birman, Barnard College Organizers: Zheng-Chao Han, Rutgers University Brian S. Mangum, Barnard College A. Shadi Tahvildar-Zadeh, Princeton Walter D. Neumann, Barnard College University 9:00AM The Orbifold Theorem. Preliminary report. 9:00AM Singularities for solutions of the wave equation on (20) Daryl Cooper*, UCSB, Craig Hodgson, Melbourne, (33) conic manifolds. Preliminary report. and Steve Kerckhoff, Stanford (959-57-166) Richard B Melrose,MIT,andJared Wunsch*, SUNY 9:30AM Covering spaces and Dehn fillings. Stony Brook (959-35-187) (21) Cynthia L. Curtis, The College of New Jersey 9:30AM Instantons, Characteristic Classes, and Nonlinear (959-57-198) I (34) Elliptic Equations. 10:00AM Towards unification of number theory and Yisong Yang, Polytechnic University (959-35-125) (22) 3-dimensional topology. Preliminary report. 10:00AM Asymptotics for Maxwell-Chern-Simons vortices. Adam S Sikora, CRM/ISM (959-57-288) (35) Tonia Ricciardi, Dipartimento di Matematica e 10:30AM Mahler measure and Alexander polynomials of links. Applicazioni, Universit`a di Napoli “Federico II” (23) Daniel S Silver*andSusan G Williams, University (959-35-143) of South Alabama (959-57-103) 10:30AM Lp Estimates for the Wave Equation with a (36) Slowly-Decaying Potential. Preliminary report. John G Stalker*, Princeton University, Fabrice Special Session on Symbolic Computation and Planchon, CNRS, Paris VI, and A. Shadi Kleinian Groups, I Tahvildar-Zadeh, Rutgers University (959-35-268)

9:00 AM – 10:45 AM Room 203, Mathematics Building Special Session on Riemannian Manifolds and Their Organizers: Jane P. Gilman, Rutgers University Limit Spaces, I Mika K. Sepp¨al¨a, Florida State 9:00 AM – 11:00 AM Room 405, International University Affairs Building 8:45AM Symbolic Computation on Kleinian Groups. (24) Preliminary report. Organizers: Xiaochun Rong, Rutgers University Jane Gilman, Rutgers-Newark (959-20-267) Christina Sormani, Lehman College, 9:10AM Hyperbolic Volumes. Preliminary report. CUNY (25) Gaven Martin*andT. Marshall, University of 9:00AM A class of generalized convex functions and its Auckland, New Zealand (959-20-293) (37) relation to warped products. Preliminary report. 9:35AM Hecke operators, arithmetic groups, and the Stephanie B Alexander*andRichard L. Bishop, (26) cohomology of subgroups of SL4(Z). University of Illinois at Urbana-Champaign Paul E Gunnells, Rutgers University (959-11-197) (959-53-164)

DECEMBER 2000 NOTICES OF THE AMS Appendix–17 Program of the Sessions – New York, NY, Saturday, November 4 (cont’d.)

9:45AM Differential Forms, Spinors and Bounded Curvature 4:50PM The surjectivity problem for one-generator, (38) Collapse. (49) one-relator extensions of torsion-free groups. John Lott, University of Michigan (959-58-118) Marshall M. Cohen*, Cornell University, and Colin 10:30AM A Sheaf Perspective on L2 Harmonic Forms. Rourke, Warwick University (959-20-160) (39) Preliminary report. 5:20PM The chameleon groups of Richard J. Thompson: Eugenie Hunsicker*, Lawrence University, and Rafe (50) categories with mutliplication. Mazzeo, Stanford University (959-53-263) Matt Brin, SUNY Binghamton (959-20-235)

Special Session on Combinatorial Group Theory, I

9:30 AM – 10:50 AM Room 404, International Special Session on the Topology of 3-Manifolds, II Affairs Building 2:30 PM – 5:20 PM Room 312, Mathematics Building Organizers: Gilbert Baumslag, City College (CUNY) Organizers: Joan S. Birman, Barnard College Sean T. Cleary, City College (CUNY) Brian S. Mangum, Barnard College Alexei Myasnikov, City College (CUNY) Walter D. Neumann, Barnard College Vladimir Shplirain, City College (CUNY) 2:30PM Cusp volumes and cusp densities for hyperbolic (51) 3-manifolds. Preliminary report. 9:30AM Diophantine geometry for free groups, dimension of (40) algebraic varieties. Colin C Adams, Williams College (959-57-260) Olga Kharlampovich, McGill University, Canada 3:00PM Metric characterizations of spherical and Euclidean (959-20-204) (52) buildings. Ruth M Charney*, Ohio State University, 10:00AM Finitely presented torsion-by-cyclic non-amenable (41) group. and Alexander Lytchak, University of Bonn A.Yu. Ol’shanskii*andM.V. Sapir, Vanderbilt (959-20-273) University (959-20-217) 3:30PM All flat manifolds are hyperbolic orbifold cusp (53) cross-sections. 10:30AM Pro-algebraic hulls of discrete groups: examples (42) and questions. Darren D Long*, UC Santa Barbara, and Alan W Andy R Magid, University of Oklahoma (959-20-80) Reid, University of Texas (959-57-116) 4:00PM The Quest for the Low Volume Hyperbolic Invited Address (54) 3-Manifold. Preliminary report. Robert Meyerhoff, Boston College (959-57-272) 11:00 AM – 11:50 AM Room 309, Havemeyer Building 4:30PM Bounded geometry for hyperbolic manifolds. (55) , SUNY at Stony Brook (959-57-175) (43) Operators on graphs: Soliton systems, scattering Yair N Minsky theory and symplectic geometry. 5:00PM The double of the figure eight is GFERF. Sergey P. Novikov, U. of Maryland and Landau (56) Alan W Reid*, U. T. Austin, and Darren Long, Institute for Theoretical Physics (959-47-02) U.C.S.B. (959-57-188)

Invited Address

1:30 PM – 2:20 PM Room 309, Havemeyer Building Special Session on Arrangements of Hyperplanes, II

(44) Equidistribution on Shimura varieties and 2:30 PM – 5:50 PM Room 207, Mathematics Building applications. Paula Cohen, CNRS, Lille, France (959-11-03) Organizers: Michael J. Falk, Northern Arizona University Special Session on Combinatorial Group Theory, II Alexander I. Suciu, Northeastern University 2:30 PM – 5:40 PM Room 404, International Affairs Building 2:30PM Shephard Groups and the Sign Representation. (57) Peter Orlik, University of Wisconsin at Madison, Organizers: Gilbert Baumslag, City College (CUNY) Victor Reiner, School of Mathematics, and Anne V Sean T. Cleary, City College (CUNY) Shepler*, University of California at Santa Cruz Alexei Myasnikov, City College (CUNY) (959-52-249) Vladimir Shplirain, City College 3:05PM Cohomology ring of the complement to rational (CUNY) (58) arrangements and Generalized Aomoto Complexes. 2:30PM Word reversing and torsion freeness. Jos´e I Cogolludo, Universidad Complutense de (45) Patrick Dehornoy, University of Caen, France Madrid (959-14-264) (959-20-136) 3:40PM Constructing Canonical Generating Sets for the

3:00PM On subgroup separability in hyperbolic Coxeter I (59) Module of A-Derivations of an Arrangement of (46) groups. Hyperplanes and Conditions Determining Freeness. Darren D Long*, UC Santa Barbara, and Alan W John M Keaty, IBM Austin, Texas (959-14-289) Reid, University of Texas (959-22-119) 4:15PM Reflection Groups and Milnor Fiber Complexes. 3:30PM Action of braid groups on determinantal ideals, (60) Stephen D Szydlik, University of (47) compact spaces and a stratification of Teichmuller¨ Wisconsin-Oshkosh (959-52-242) space. 4:50PM Compactifications of real subspace and half-space Stephen P Humphries, Brigham Young University (61) arrangements. Preliminary report. (959-20-78) Giovanni Gaiffi, Scuola Normale Superiore di Pisa, 4:00PM Break. Italy (959-52-132) 4:20PM Finite and nilpotent quotients of braid groups and 5:25PM Resonance varieties and fibered arrangements.

(48) link groups. Preliminary report. I (62) Preliminary report. Theodore Stanford, New Mexico State University Michael J Falk, Northern Arizona University (959-57-270) (959-52-251)

Appendix–18 NOTICES OF THE AMS VOLUME 47, NUMBER 11 New York, NY, Saturday, November 4 – Program of the Sessions

Special Session on Arithmetic Geometry and Modular 3:00PM Polynomial functors on complexes. Forms, I (77) Alexandre Tchernev*, University at Albany,SUNY, and Jerzy Weyman, Northeastern University 2:30 PM – 5:50 PM Room 209, Havemeyer Building (959-13-201) 3:30PM Frobenius and Tor. Organizers: Dorian Goldfeld, Columbia University (78) Claudia Miller, Michigan State University Paula Cohen, CNRS, Lille, France (959-13-274) PM 2:30 Nonanalytic Poincar´e Series and Eichler Integrals. 4:00PM The Buchsbaum-Rim polynomial and the integral (63) Preliminary report. (79) closure of a module. Preliminary report. Wladimir A Pribitkin, Princeton University Joseph P Brennan*, North Dakota State University, (959-11-95) Bernd Ulrich, Michigan State University, and 3:00PM N´eron-Tate projection of algebraic points. Wolmer V Vasconcelos, Rutgers University (64) Preliminary report. (959-13-291) Bjorn Poonen, U. C. Berkeley (959-11-215) 4:30PM A Technique for the Explicit Computation of Local 3:30PM Families of L -functions and applications. (80) Cohomology with Respect to Monomial Ideals. (65) Peter Sarnak, Princeton University (959-11-202) Andrew S Richardson, University of Illinois at 4:00PM The Least Prime in a Conjugacy Class. Urbana-Champaign (959-13-127) (66) Kumar Murty, University of Toronto (959-11-229) 5:00PM Building integral domains using power series. 4:30PM Coverings of curves with asymptotically many (81) Preliminary report. (67) rational points. William Heinzer, Purdue, Christel Rotthaus, W.-C. W. Li*, Penn State University, and H. Maharaj, Michigan State University, and Sylvia M Wiegand*, Institute of Discrete Mathematics (959-11-199) University of Nebraska-Lincoln (959-13-209) 5:00PM The Euclidean Algorithm in Number Fields. 5:30PM Commutativity of Hochschild Cohomology.

I (68) Preliminary report. (82) Preliminary report. Ram Murty, Queen’s University (959-11-180) Ragnar-Olaf Buchweitz*, Univ. of Toronto, and 5:30PM Subvarieties of Shimura varieties. Hubert Flenner, Ruhr-Universitaet Bochum (69) Bas Edixhoven, University of Rennes (959-11-142) (959-18-205)

Special Session on Differential Algebra and Related Special Session on Algebraic Geometry, II Topics, II 2:30 PM – 4:50 PM Room 417, Mathematics Building 2:30 PM – 5:20 PM Room 410, International Affairs Building Organizers: Sorin Popescu, Columbia University Organizers: Li Guo, Rutgers University at Newark Lev A. Borisov, Columbia University William Keigher, Rutgers University at Newark 2:30PM The Decomposition Theorem for Hochschild (83) (Co-)Homology of Complex Spaces. Preliminary , City College (CUNY) William Sit report. 2:30PM Central configurations in the Newtonian N-body Ragnar-Olaf Buchweitz*, Univ. of Toronto, and (70) problem of Celestial Mechanics. Hubert Flenner, Ruhr-Universitaet Bochum Ilias Kotsireas, Ontario Research Centre for (959-14-203) Computer Algebra (959-70-269) 3:00PM Deformations of moduli spaces and 3:00PM On Applications of Cartan’s Method of Moving (84) non-commutative geometry. Preliminary report.

I (71) Frames. Preliminary report. Ludmil Katzarkov, UC Irvine, Dmitry Orlov, Irina A Kogan, Yale University (959-53-237) Steklov Institute, Russia, and Tony Pantev*, 3:30PM D-modules on smooth toric varieties. University of Pennsylvania (959-14-221) (72) Mircea Mustata, Gregory Smith, University of 3:30PM Mirror symmetry, Langlands duality, and the California at Berkeley, Harrison Tsai*, Cornell (85) Hitchin system. University, and Uli Walther, Purdue University Michael Thaddeus, Columbia University (959-14-207) (959-14-165) 4:00PM Differential Operators on Toric Varieties. 4:00PM Symmetry groups in mirror symmetry. (73) Preliminary report. (86) Paul Horja, Institute for Advanced Study William N Traves*, U.S. Naval Academy, and (959-14-130) Mutsumi Saito, Hokkaido University, Japan 4:30PM A Fourier-Mukai approach to spectral data for (959-13-91) (87) instantons. Preliminary report. 4:30PM Rank Jumps in A-Hypergeometric Systems. Marcos B Jardim*, University of Pennsylvania and (74) Laura F Matusevich, University of California at Haverford College, and Antony Maciocia, University Berkeley (959-05-138) of Edinburgh (959-14-57) 5:00PM Multivariable Differential Dimension Polynomials. (75) Alexander B Levin, The Catholic University of America, Washington, D. C. (959-12-102) Special Session on Nonlinear Partial Differential Equations, II Special Session on Commutative Algebra, II 2:30 PM – 4:50 PM Room 403, International Affairs Building 2:30 PM – 5:50 PM Room 411, International Affairs Building Organizers: Zheng-Chao Han, Rutgers University Organizers: Irena Peeva, Cornell University A. Shadi Tahvildar-Zadeh, Princeton Luchezar Avramov, Purdue University University 2:30PM Finite Correspondences between commutative rings 2:30PM Antiferromagnetism and quantum Hall effects on (76) and motivic functors. Preliminary report. (88) magnetic bubbles. Charles A Weibel, Rutgers University (959-13-193) Fang-Hua Lin, Courant Institute-NYU (959-35-230)

DECEMBER 2000 NOTICES OF THE AMS Appendix–19 Program of the Sessions – New York, NY, Saturday, November 4 (cont’d.)

3:00PM A Ginzburg-Landau Type Equation from 3:25PM On compact Riemann surfaces with dihedral groups (89) Ante-ferromagnets and Related Problems. (103) of automorphisms. Fengbo Hang*andFanghua Lin, Courant Institute Emilio Bujalance, Dept. Matem´aticas (959-35-227) Fundamentales, Universidad Nacional Educacion´ a 3:30PM Regularity of the blow-up set of a semilinear heat Distancia, Madrid (Spain), Francisco-Javier Cirre*, (90) equation. Dept. Geometry and Topology, Universidad Hatem Zaag, Courant Institute and CNRS ENS Complutense de Madrid, Spain, Jose-Manuel (959-35-139) Gamboa, Dept. Algebra, Universidad Complutense de Madrid, Spain, and Grzegorz Gromadzki, 4:00PM Improved regularity results for the quasilinear Institute of Mathematics, University of Gdansk,´ (91) wave equations. Preliminary report. Poland (959-30-238) Sergiu Klainerman and Igor Rodnianski*, Princeton University (959-35-189) 3:50PM Removing short geodesics in hyperbolic (104) 3-manifolds. Preliminary report. 4:30PM The Vlasov-Poisson-Boltzmann system near vaccum. Kenneth W Bromberg, University of Michigan (92) Yan Guo, Division of Applied Math. Brown (959-30-228) University (959-35-126) 4:20PM Break. Session for Contributed Papers, II 4:40PM Generalized intersection theory of curves on a (105) surface. Preliminary report. 2:30 PM – 4:55 PM Room 520, Mathematics Building Moira Chas, CUNY Graduate Center (959-57-265) 5:05PM On classical and neo-classical Schottky groups. 2:30PM A geometric interpretation of µ¯(ijk). Preliminary (106) Rub´en Hidalgo, Univ. Tecnico F. Santa Maria, and I (93) report. Bernard Maskit*, The University at Stony Brook Blake Mellor*, Honors College, FAU, and Paul (959-30-141) Melvin, Bryn Mawr College (959-57-111) 2:45PM Instability of Statistical Factor Analysis. Preliminary Special Session on Riemannian Manifolds and Their (94) report. Limit Spaces, II Steven P Ellis, Columbia University and NYSPI (959-65-144) 3:00 PM – 5:45 PM Room 405, International Affairs Building 3:00PM Constructions of Bivariate Polynomial Compositions (95) Using Puiseux’s Theorem. Organizers: Xiaochun Rong, Rutgers University Donald D Mills*, U.S. Military Academy, and Kent Christina Sormani, Lehman College, M Neuerburg, Southeastern Louisiana University CUNY (959-12-152) 3:00PM Kahler¨ parabolicity and the Euler number of

3:15PM Inhomogeneous Iterates and Stability of Fixed I (107) compact manifolds of non-positive sectional (96) Points. curvature. Yong-Zhuo Chen, University of Pittsburgh at Jianguo Cao, University of Notre Dame Bradford (959-47-177) (959-53-114) 3:30PM On the diophantine equation X4 + m ∗ Y 4 = Z2. 3:45PM The second twisted Betti number and the strong

I (97) Preliminary report. (108) convergence of collapsing Riemannian manifolds. Claude Levesque*, Universite Laval, and Omar Preliminary report. Kihel, University of Lethbridge (959-11-246) Fuquan Fang, Nankai University, Tianjin, China 3:45PM On the quadratic equation problem for small (959-53-218) (98) cancellation groups. 4:30PM Pushing manifolds together in Gromov-Hausdorff Martin Greendlinger*, Art Institute, Elena (109) space. Preliminary report. Greendlinger and Leonard Greendlinger, Temple Steven C Ferry*, Rutgers University, and Alexander University (959-20-266) N Dranishnikov, Pennsylvania State University 4:00PM Break. (959-57-281) 4:15PM A probability measure associated with L´evy 5:15PM Collapsing 4-manifolds under a lower curvature

(99) processes defined on Riemannian manifolds. I (110) bound. Preliminary report. Preliminary report. Takao Yamaguchi, Kyushu University (959-53-292) Patricia Giurgescu, Pace University (959-60-256) 4:30PM Higher order intersection numbers and Whitney (100) towers. Rob Schneiderman*, UC Berkeley, and Peter Sunday, November 5 Teichner, UC San Diego (959-57-113) 4:45PM Topological Aspects of Electromagnetic Design Meeting Registration

I (101) Problems Requiring Noncommutative Functors. Preliminary report. 8:00 AM – NOON First Floor, Havemeyer Building P. Robert Kotiuga, Boston University (959-57-99) AMS Exhibit and Book Sale Special Session on Symbolic Computation and Kleinian Groups, II 8:00 AM – NOON First Floor, Havemeyer Building

3:00 PM – 5:25 PM Room 203, Mathematics Building Special Session on Arithmetic Geometry and Modular Forms, II Organizers: Jane P. Gilman, Rutgers University Mika K. Sepp¨al¨a, Florida State 8:00 AM – 10:50 AM Room 209, Havemeyer Building University Organizers: Dorian Goldfeld, Columbia University 3:00PM The Apollonian metric. (102) Frederick W Gehring*, University of Michigan, and Paula Cohen, CNRS, Lille, France Kari Hag, Norwegian University of Science and 8:00AM Families of Wildly Ramified Covers of Curves. Technology (959-30-151) (111) Rachel J Pries, Columbia University (959-14-179)

Appendix–20 NOTICES OF THE AMS VOLUME 47, NUMBER 11 New York, NY, Sunday, November 5 – Program of the Sessions

8:30AM Modularity of Q-curves and twisted Fermat Special Session on Nonlinear Partial Differential (112) equations. Equations, III Jordan S Ellenberg, Princeton University (959-11-184) 8:30 AM – 10:50 AM Room 403, International 9:00AM Congruences between Hilbert Modular Forms. Affairs Building (113) Eyal Z Goren, McGill University (959-11-206) Organizers: Zheng-Chao Han, Rutgers University 9:30AM Euler systems and Mordell-Weil groups over ring (114) class fields of real quadratic fields. A. Shadi Tahvildar-Zadeh, Princeton Henri Darmon, McGill University (959-11-297) University 8:30AM Singular Perturbations and First Order PDE on 10:00AM Metrized line bundles on elements of the Tate (115) Shafarevich group. Preliminary report. (127) Manifolds. Lucien S Szpiro, CNRS , CUNY (959-11-213) David Holcman*, Weizmann institute of science, and Ivan Kupka, Paris VI university (959-53-98) 10:30AM The Arakelov zeta function of van der Geer and (116) Schoof. 9:00AM Stability of localized solutions of a Landau-Lifshitz Jeffrey C Lagarias*andEric Rains, AT&T Labs (128) equation. Preliminary report. (959-11-112) Stephen J Gustafson*andJalal Shatah, Courant Institute (959-35-250) 9:30AM Hamiltonian motions under strong constrains. Special Session on Differential Algebra and Related (129) Preliminary report. Topics, III Jalal Shatah, Courant Institute, and Chongchun Zeng*, University of Virginia (959-35-191) 8:30 AM – 10:50 AM Room 410, International 10:00AM Liouville Properties and a conjecture of de Giorgi. Affairs Building (130) Changfeng Gui, University of Connecticut (959-35-234) Organizers: Li Guo, Rutgers University at Newark 10:30AM Liouville and Harnack type theorems for semilinear William Keigher, Rutgers University at (131) elliptic equations. Preliminary report. Newark Lei Zhang, Rutgers University (959-35-120) William Sit, City College (CUNY) 8:30AM Generalized Differential Resultants and Differential (117) Reultant Sytems in the Ordinary Case. Preliminary Special Session on Arrangements of Hyperplanes, III report. Giuseppa Carra’-Ferro, University of Catania 8:40 AM – 10:50 AM Room 207, Mathematics Building (959-13-259) Organizers: Michael J. Falk, Northern Arizona 9:00AM A p-adic Algorithm for Computing Grobner¨ Bases. University (118) Preliminary report. Alexander I. Suciu, Northeastern Elizabeth A. Arnold, Texas A&M University University (959-13-241) 8:40AM Resonance Varieties and Tangent Cones to 9:30AM Characteristic Sets and Grobner Bases. Preliminary (132) Characteristic Varieties. Preliminary report. (119) report. Daniel Matei*, University of Rochester, and Sally D Morrison, Bucknell University (959-12-240) Alexander I Suciu, Northeastern University 10:00AM Factorisation Free Algorithms in Differential and (959-14-167) (120) Difference Algebra. Preliminary report. 9:15AM Random walks and hyperplane arrangements. Evelyne Hubert, INRIA (959-39-226) (133) Kenneth S. Brown, Cornell University (959-60-122) 10:30AM Definitive Computation of Bernstein-Sato (121) Polynomials. 9:50AM A commutative algebra for oriented matroids.

I (134) Preliminary report. Anton Leykin, University of Minnesota (959-14-145) Raul Cordovil, Dept. Math. -IST (959-05-232) 10:25AM Matroids and quotients of spheres. (135) Edward B Swartz, Cornell University (959-52-245) Special Session on Commutative Algebra, III

8:30 AM – 10:50 AM Room 411, International Special Session on Combinatorial Group Theory, III Affairs Building 9:00 AM – 10:50 AM Room 404, International Organizers: Irena Peeva, Cornell University Affairs Building Luchezar Avramov, Purdue University Organizers: Gilbert Baumslag, City College (CUNY) 8:30AM Do characteristic p power series yield p-fractals? (122) Preliminary report. Sean T. Cleary, City College (CUNY) Paul Monsky, Brandeis University (959-13-109) Alexei Myasnikov, City College (CUNY) 9:00AM Acyclicity of Tate extensions. Vladimir Shplirain, City College (123) Srikanth Iyengar, University of Sheffield (CUNY) (959-13-101) 9:00AM Quotients of automorphism groups of free groups. 9:30AM Higher Sally modules. Preliminary report. (136) Preliminary report. (124) Claudia Polini, University of Oregon (959-13-192) Martin R Bridson, University of Oxford, and Karen 10:00AM Jets of singular pairs. Preliminary report. Vogtmann*, Cornell University (959-20-233) (125) Mircea I Mustata, University of California, Berkeley 9:30AM Computation in groups using quantum automata. (959-14-176) (137) Preliminary report. 10:30AM An algebraic proof of Zak’s inequality for the Eric M Freden, Southern Utah University (126) dimension of the Gauss image. Preliminary report. (959-20-107) Aron Simis, Federal University of Pernambuco, 10:00AM The residual finiteness of one-relator groups with Karen Smith, University of Michigan, and Bernd (138) torsion. Ulrich*, Michigan State University (959-13-214) Daniel T Wise, Brandeis University (959-20-196)

DECEMBER 2000 NOTICES OF THE AMS Appendix–21 Program of the Sessions – New York, NY, Sunday, November 5 (cont’d.)

10:30AM Tame almost primitive elements. Special Session on Riemannian Manifolds and Their (139) Gerhard Rosenberger, University of Dortmund, Limit Spaces, III Germany (959-20-174) 9:00 AM – 11:00 AM Room 405, International Special Session on the Topology of 3-Manifolds, III Affairs Building Organizers: Xiaochun Rong, Rutgers University 9:00 AM – 10:50 AM Room 312, Mathematics Building Christina Sormani, Lehman College, Organizers: Joan S. Birman, Barnard College CUNY Brian S. Mangum, Barnard College 9:00AM Differentiability of Lipschitz functions on metric Walter D. Neumann, Barnard College (153) measure spaces. Jeff Cheeger, Courant Institute, NYU (959-58-277) 9:00AM The Yang-Mills Measure in the Kauffman Bracket (140) Skein Module. 9:45AM Hausdorff Convergence and Universal Covers. Doug Bullock, Boise State University, Charles D (154) Christina Sormani, Lehman College, CUNY, and Frohman*, University of Iowa, and Joanna Guofang Wei*, UCSB (959-53-146) Kania-Bartoszynska, Boise State University 10:30AM On fundamental groups of manifolds of (959-57-129) (155) nonnegative curvature. 9:30AM 3-Manifolds up to complexity 9 Carlo Petronio (joint Burkhard Wilking, University of Pennsylvania (141) with Bruno Martelli). (959-53-239) Carlo Petronio, University of Pisa (959-57-94) 10:00AM Symplectic structure on colorings of tangles. Invited Address (142) Preliminary report. Jozef H Przytycki, George Washington University 11:00 AM – 11:50 AM Room 309, Havemeyer Building (959-57-278) (156) Topology of hyperplane arrangements. 10:30AM On special 2-polyhedra and fake surfaces. (143) Duˇsan Repovˇs, University of Ljubljana (959-57-93) Alexander I. Suciu, Northeastern University (959-57-01) Special Session on Symbolic Computation and Kleinian Groups, III Invited Address

9:00 AM – 10:45 AM Room 203, Mathematics Building 1:30 PM – 2:20 PM Room 309, Havemeyer Building Organizers: Jane P. Gilman, Rutgers University (157) String theory and quantum geometry. Brian Greene, Columbia University (959-83-04) Mika K. Sepp¨al¨a, Florida State University 8:45AM Little groups and Jacobians. Special Session on Combinatorial Group Theory, IV (144) Angel Carocca and Rub´ıE.Rodr´ıguez*, P. Universidad Catolica´ de Chile (959-30-172) 2:30 PM – 4:50 PM Room 404, International Affairs Building 9:10AM On full automorphism groups of Riemann surfaces. Organizers: Gilbert Baumslag, City College (CUNY) (145) Emilio Bujalance, U.N.E.D. (959-14-253) Sean T. Cleary, City College (CUNY) 9:35AM On the connection of the locus of real Riemann Alexei Myasnikov, City College (CUNY) (146) surfaces. Antonio F Costa*, UNED, and Milagros Izquierdo, Vladimir Shplirain, City College Malardalen University (959-14-162) (CUNY) 10:00AM Computations with Tori. Preliminary report. 2:30PM Test elements in hyperbolic groups. (147) Eric Klassen, Craig A Nolder*, Mika K Sepp¨al¨a and (158) Edward C. Turner, SUNY Albany (959-20-135) Tyler Sutton, Florida State University (959-30-236) 3:00PM Proper actions of lattices on contractible manifolds. 10:25AM Numerical Uniformization. (159) Preliminary report. (148) Mika Sepp¨al¨a, Florida State University (959-30-254) Mladen Bestvina, University of Utah, and Mark Feighn*, Rutgers University, Newark (959-20-149) Special Session on Algebraic Geometry, III 3:30PM Free nilpotent groups are nondiscriminating. (160) Preliminary report. 9:00 AM – 10:50 AM Room 417, Mathematics Building Benjamin Fine*, Fairfield University, Anthony Gaglione, United States Naval Academy, Alexei Organizers: Sorin Popescu, Columbia University Myasnikov, City College, and Dennis Spellman, Lev A. Borisov, Columbia University Temple University (959-20-223) 9:00AM Elementary Transversality in the Schubert Calculus. 4:00PM Multiplication tables of groups. (149) Frank Sottile, University of Massachusetts, Amherst (161) Robert H Gilman, Stevens Institute of Technology (959-14-163) (959-00-216) 9:30AM The structure sheaf of a quiver variety. 4:30PM On fixed subgroups of a free group. (150) Anders S Buch, Massachusetts Institute of (162) Enric Ventura*, Universitat Polite`cnica de Technology (959-14-190) Catalunya, Spain, and Armando Martino,City University of London, UK (959-20-244) 10:00AM Toric Residues and Hypergeometric Functions. (151) Eduardo Cattani*, University of Massachusetts, Amherst, Alicia Dickenstein, Universidad de Special Session on the Topology of 3-Manifolds, IV Buenos Aires, and Bernd Sturmfels, University of California, Berkeley (959-14-140) 2:30 PM – 5:20 PM Room 312, Mathematics Building 10:30AM Szpiro Inequality for Symplectic Lefshetz Pencils. Organizers: Joan S. Birman, Barnard College (152) Preliminary report. Fedor A Bogomolov, Courant Institute of Brian S. Mangum, Barnard College Mathemaical Sciences (959-14-219) Walter D. Neumann, Barnard College

Appendix–22 NOTICES OF THE AMS VOLUME 47, NUMBER 11 New York, NY, Sunday, November 5 – Program of the Sessions

2:30PM A new class of useful surfaces in 3-manifolds. 4:00PM Base change and a problem of Serre. (163) David C Bachman, University of Illinois at Chicago (177) Christopher McLean Skinner, University of (959-57-294) Michigan (959-11-299) 3:00PM The mapping class group of a genus 2 surface is 4:30PM The Hecke convergence factor and modular forms (164) linear. (178) of small negative even integral weight. Stephen J Bigelow, Berkeley, and Ryan D Budney*, Marvin I. Knopp, Temple University (959-11-298) Cornell (959-57-82) 5:00PM Elliptic Curves and An Extensions of Q. 3:30PM Dynnikov’s formulas for the linear ordering of (179) Mark F Evans, Vassar College (959-11-96) (165) braids. 5:30PM The Bloch-Kato conjecture for the adjoint motive of Patrick Dehornoy, University of Caen, France (180) a modular form. Preliminary report. (959-57-183) Fred Diamond, Brandeis University, Matthias 4:00PM Torsion elements in the mapping class group of a Falch, California Institute for Technology, and Li (166) surface. Guo*, Rutgers University - Newark (959-11-200) Feng Luo, Rutgers University (959-57-147) 4:30PM Ordering 3-manifold groups. Preliminary report. Special Session on Differential Algebra and Related (167) Dale P. Rolfsen*, University of British Columbia, Topics, IV Bert Wiest, UBC-PIMS postdoctoral fellow, and Steven Boyer, UQAM (959-55-117) 2:30 PM – 5:20 PM Room 410, International Affairs Building 5:00PM Unknotting tunnels and Seifert surfaces. Preliminary Organizers: Li Guo, Rutgers University at Newark (168) report. William Keigher, Rutgers University at Martin Scharlemann, U. C. Santa Barbara Newark (959-57-159) William Sit, City College (CUNY) 2:30PM Formulas for Liouvillian solutions of (third order) Special Session on Arrangements of Hyperplanes, IV (181) linear differential equations. Preliminary report. Michael F Singer, North Carolina State University, and Felix A Ulmer*, Universite de Rennes 1 2:30 PM – 5:15 PM Room 207, Mathematics Building (959-12-115) Organizers: Michael J. Falk, Northern Arizona 3:00PM On initial value problems for ordinary University (182) differential-algebraic equations. Alexander I. Suciu, Northeastern Frank Leon Pritchard*, York College of The City University University of New York, and William Yu Sit,TheCity College of The City University of New York 2:30PM There is no tame triangulation of the infinite real (169) Grassmannian. (959-34-124) Laura M Anderson*, Texas A&M University, and 3:30PM The ring of global sections of diffspec R. Preliminary James F Davis, Indiana University (959-05-224) (183) report. Jerald J Kovacic, New York, NY (959-14-85) 3:05PM Grobner¨ fans of codimension three lattice ideals. (170) Preliminary report. 4:00PM Algebraic solutions of linear differential equations.

Serkan Hos¸ten, San Francisco State University, I (184) Preliminary report. Diane Maclagan*, Institute for Advanced Study, and Mark van Hoeij, Florida State University Bernd Sturmfels, University of California, Berkeley (959-34-105) (959-13-284) 4:30PM On the invariants of linear ordinary differential 3:40PM The other braid monoid. (185) equations. (171) David Bessis, Yale University (959-20-153) Manuel Bronstein, INRIA (959-34-220) 4:15PM Deformations of hyperplane arrangements. 5:00PM Differential equations in positive characteristic. (172) Michel Jambu, Universit´e de Nantes, France (186) Marius van der Put, University of Groningen (959-52-296) (959-34-285) 4:50PM Stability and Jump Loci for a family of bundles on Special Session on Commutative Algebra, IV (173) P2. Hal Schenck, Harvard University (959-14-156) 2:30 PM – 3:50 PM Room 411, International Affairs Building Organizers: Irena Peeva, Cornell University Special Session on Arithmetic Geometry and Modular Luchezar Avramov, Purdue University Forms, III 2:30PM The Canonical Element Conjecture as representation (187) theory of Gorenstein rings. 2:30 PM – 5:50 PM Room 209, Havemeyer Building Jan R Strooker, Universiteit Utrecht (959-13-131) Organizers: Dorian Goldfeld, Columbia University 3:00PM Gorenstein algebras from sections of modules. (188) Jan O Kleppe, Oslo University College, and Chris S Paula Cohen, CNRS, Lille, France Peterson*, Colorado State University (959-13-158) 2:30PM Modular Correspondances and Invariant Measures. 3:30PM Polynomials with general C2–fibers are variables. (174) Emmanuel B Ullmo, Princeton University (189) Preliminary report. (959-11-181) Shulim Kaliman, University of Miami (959-13-261) 3:00PM Small points for a family of heights. Preliminary (175) report. Special Session on Algebraic Geometry, IV Shou-Wu Zhang, Columbia University (959-11-137) 3:30PM Vanishing of twists of modular L-functions. 2:30 PM – 4:20 PM Room 417, Mathematics Building (176) Preliminary report. Organizers: Sorin Popescu, Columbia University Brian Conrey*, American Institute of Mathematics, Jonathan P Keating,BRIMS,Michael Rubinstein, Lev A. Borisov, Columbia University University of Texas, and Nina C Snaith, Bristol 2:30PM Factorization of birational maps. Preliminary report. University (959-11-185) (190) Kalle Karu, Harvard University (959-51-271)

DECEMBER 2000 NOTICES OF THE AMS Appendix–23 Program of the Sessions – New York, NY, Sunday, November 5 (cont’d.)

3:00PM Rational points on algebraic surfaces. (191) Yuri Tschinkel, Princeton University (959-14-225) 3:30PM The Hard Lefschetz theorem and the topology of (192) semismall maps. Mark Andrea A de Cataldo*, SUNY at Stony Brook, and Luca Migliorini, University of Trento (959-14-154) 4:00PM Algebraic and geometric isomonodromic (193) deformations. Charles F Doran, Columbia University (959-14-168)

Special Session on Nonlinear Partial Differential Equations, IV

2:30 PM – 4:20 PM Room 403, International Affairs Building Organizers: Zheng-Chao Han, Rutgers University A. Shadi Tahvildar-Zadeh, Princeton University 2:30PM A priori estimate for a class of Monge-Ampere type (194) equation. Sun-Yung A Chang, Princeton University (959-35-231) 3:00PM Apriori Estimaes on Scalar Curvature Equations and (195) Gaussian Curvature in Negative Case. Wenxiong Chen*, Southwest Missouri State University, and Congming Li, University of Colorado (959-35-108) 3:30PM On the motion of the interface between two fluids. (196) Preliminary report. Sijue Wu, University of Maryland, College Park (959-35-212) 4:00PM Existence results for some polymeric flows. (197) Preliminary report. Nader Masmoudi, Courant Institute (959-35-186)

Special Session on Riemannian Manifolds and Their Limit Spaces, IV

3:00 PM – 5:45 PM Room 405, International Affairs Building Organizers: Xiaochun Rong, Rutgers University Christina Sormani, Lehman College, CUNY 3:00PM Curvature, momentum and variance. (198) Jyh-Yang Wu, National Chung Cheng University, Taiwan (959-58-161) 3:45PM Discussion. 4:30PM A deformation of noncompact Einstein (199) solvmanifolds. Preliminary report. Megan M Kerr, Wellesley College (959-53-222) 5:15PM A variational approach for homogeneous Einstein (200) metrics. Wolfgang Ziller*, University of Pennsylvania, Christoph Boehm, Universitaet Kiel, and McKenzie Wang, McMaster University (959-53-121)

Lesley M. Sibner Associate Secretary Brooklyn, New York

Appendix–24 NOTICES OF THE AMS VOLUME 47, NUMBER 11