AMS Sectional Meeting Program by Day
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1999 Fall Eastern Sectional Meeting
Providence, RI, October 23, 1999
Meeting #947
Associate secretaries:
Lesley M Sibner, AMS
lsibner@duke.poly.edu
Sunday October 3, 1999

Sunday October 3, 1999, 8:00 a.m.12:00 p.m.
Meeting Registration
Lounge, Slavin Center

Sunday October 3, 1999, 8:00 a.m.10:55 a.m.
Special Session on Operator KTheory and its Applications to Geometry and Topology
Room 301, Harkins Hall
Organizers:
Guoliang Yu, University of Colorado, Boulder gyu@euclid.Colorado.EDU
Carla E. Farsi, University of Colorado, Boulder farsi@euclid.colorado.edu
Jeffrey S. Fox, University of Colorado, Boulder jfox@euclid.colorado.edu

8:00 a.m.
Signatures and covering spaces.
Wolfgang L\"uck, Univ M\'unster
Thomas Schick*, Penn State University and Uni Münster
(9475513)

8:45 a.m.
Volume Growth and Positive Scalar Curvature.
Guihua Gong*, Univ. of Puerto Rico, Rio Piedras
Guoliang Yu, Uinversity of Colorado, Boulder
(9471963)

9:30 a.m.
Monicity of the BaumConnes map.
Gunnar Carlsson, Stanford university
Erik K Pedersen*, Bingham University
John Roe, Penn State
(94719112)

10:15 a.m.
Connes' Index Theorem for Groupoids.
Jerome Kaminker*, IUPUI, Indianapolis, IN
(94719166)

Sunday October 3, 1999, 8:00 a.m.10:20 a.m.
Special Session on Difference Equations and Applications
Room 108, Albertus Magnus Hall
Organizers:
Gerasimos Ladas, University of Rhode Island gladas@math.uri.edu
Jeffrey T. Hoag, Providence College jhoag@providence.edu

8:00 a.m.
On the Recursive Sequence x(n+1) = (a + b x(n1))/(c + x(n)) .
Carol H Gibbons*, University of Rhode Island
M R Kulenovic, University of Rhode Island
Gerry Ladas, University of Rhode Island
(9473912)

8:30 a.m.
On the System of Difference Equations x(n+1)=x(n)/(a+y(n)), y(n+1)=y(n)/(b+x(n)).
Dean Clark, University of Rhode Island
M.R. S. Kulenovic*, University of Rhode Island
(9473932)

9:00 a.m.
The Brjuno Brush.
Eileen F Lee*, Trinity College
(9473727)

10:00 a.m.
On a Rational Recursive Sequence with Even Delays.
Hamdi ElMitwalli*, University of Rhode Island
Edward A Grove, University of Rhode Island
Gerasimos Ladas, University of Rhode Island
(9473952)

Sunday October 3, 1999, 8:00 a.m.12:00 p.m.
Exhibit and Book Sale
Lounge, Slavin Center

Sunday October 3, 1999, 8:30 a.m.10:50 a.m.
Special Session on Algebraic and Geometric Combinatorics
Room 317, Harkins Hall
Organizers:
Vesselin N. Gasharov, Cornell University vesko@math.cornell.edu
Ira M. Gessel, Brandeis University gessel@math.brandeis.edu

8:00 a.m.
The Frobenius Coin Exchange Problem and rational polytopes.
Matthias Beck, Temple University
Ricardo Diaz, University of Northern Colorado
Sinai Robins*, Temple University
(94705163)

8:30 a.m.
Lexicographic Shellability for Balanced Boolean Cell Complexes.
Patricia L Hersh*, University of Washington
(9470591)

9:00 a.m.
Discrete Morse Complexes.
Manoj Chari, Louisiana State University/TUBerlin
Michael Joswig, TUBerlin
Volkmar Welker*, Universitaet Marburg
(94705120)

9:30 a.m.
Enumerative invariants of convex polytopes.
Louis J Billera*, Cornell University
Catherine Stenson, Cornell University
(94752140)

10:00 a.m.
Signbalanced posets and spinbalanced domino tableaux.
Dennis E White*, University of Minnesota
(9470575)

10:30 a.m.
Generalized LittlewoodRichardson coefficients, canonical bases and totally positive varieties.
Arkady Berenstein, Cornell University
Andrei Zelevinsky*, Northeastern University
(9471497)

Sunday October 3, 1999, 8:30 a.m.10:50 a.m.
Special Session on Representation Theory of Reductive Groups
Room 327, Harkins Hall
Organizers:
Dan M. Barbasch, Cornell University barbasch@math.cornell.edu
Birgit Speh, Cornell University speh@math.cornell.edu

8:30 a.m.
Cohomological induction and harmonic algebra.
Gregg J. Zuckerman*, Yale University
(94717134)

9:00 a.m.
Primitive ideals and the theta correspondence.
Peter E Trapa*, Institute for Advanced Study
(9472237)

9:30 a.m.
Orthogonality relations and invariant sesquilinear forms.
Robert W Donley, Jr.*, Oklahoma State University, Stillwater
(9472222)

10:00 a.m.
Discussion.

10:30 a.m.
Deformation quantization and invariant distributions.
Martin Andler, Universite de Versailles a SanQuentin
Alexander Dvorsky, Rutgers University
Siddhartha Sahi*, Rutgers University
(94722103)

Sunday October 3, 1999, 9:00 a.m.10:50 a.m.
Special Session on Geometry and Representation Theory of Algebraic Groups
Room 328, Harkins Hall
Organizers:
James E. Humphreys, University of Massachusetts jeh@math.umass.edu
Ivan Mirkovic, University of Massachusetts mirkovic@math.umass.edu

9:00 a.m.
Conjugacy classes in parabolic subgroups of general linear groups.
Scott H Murray*, University of Chicago
(9472060)

9:30 a.m.
Certain "abstract" homomorphisms of Chevalley groups.
Lucy Lifschitz*, University of Virginia
Andrei S Rapinchuk, University of Virginia
(94720115)

10:00 a.m.
A homological interpretation of Jantzen's sum formula.
Upendra B Kulkarni*, University of Massachusetts, Amherst
(94720145)

10:30 a.m.
Some new applications of endomorphism algebras to representation theory.
Brian Parshall*, University of Virginia
(94720149)

Sunday October 3, 1999, 9:00 a.m.10:50 a.m.
Special Session on The History of Mathematics
Room I, Moore Hall
Organizers:
Daniel Otero, Xavier University otero@xavier.xu.edu
C. Edward Sandifer, Western Connecticut State University sandifer@wcsub.ctstateu.edu

9:00 a.m.
A Definition of the Natural Logarithm.
Linda Marie Saliga*, The University of Akron
(94701126)

9:40 a.m.
Elegant Fractions in Indian Astronomy.
Kim Plofker*, Brown University
(94701114)

10:20 a.m.
Nyctaginaceous Mathematics.
James J Tattersall*, Providence College
(94701130)

Sunday October 3, 1999, 9:00 a.m.10:50 a.m.
Special Session on Algebraic Dynamics
Room 109, Albertus Magnus Hall
Organizers:
Jonathan Lubin, Brown University lubinj@math.brown.edu
Joseph H. Silverman, Brown University jhs@abel.math.brown.edu

9:00 a.m.
The Lap Counting Function and Zeta Function of the Tent Map.
Leopold Flatto, Bell Laboratories
Jeffrey C Lagarias*, AT&T Labs
(9475855)

9:30 a.m.
Torsion of abelian varieties and the MortonSilverman conjecture.
Bjorn Poonen*, University of California, Berkeley
(9471143)

10:00 a.m.
Dynamical Systems and Elliptic Curves.
Graham R Everest*, University of East Anglia
(9471121)

10:30 a.m.
A Bound for Torsion Points on Everywhere Good Reduction Elliptic Curves.
Joseph H. Silverman*, Brown University
Marc Hindry, Universit\'e Denis Diderot Paris 7
(9471128)

Sunday October 3, 1999, 9:30 a.m.10:50 a.m.
Special Session on Geometric Properties of Nonlinear Elliptic PDEs
Room 135, Albertus Magnus Hall
Organizers:
Henri Berestycki, Universit\'e Pierre et Marie Curie (Paris VI)
Yanyan Li, Rutgers University yyli@math.rutgers.edu

9:30 a.m.
Nonexistence results for nonlinear equations in unbounded domains.
Isabeau Birindelli*, Dipartimento di Matematica, Universita' di Roma "La Sapienza"
(94735123)

10:00 a.m.
Some geometric problems related to PDE's.
Pablo Padilla*, IIMAS, UNAM
(94735144)

10:30 a.m.
Multipeak solutions for a nonlinear Neumann problem.
Changfeng Gui*, University of Connecticut and University of British Columbia
(9473553)

Sunday October 3, 1999, 11:00 a.m.11:50 a.m.
Invited Address
Unipotent Representations and Unitarity.
'64 Hall, Slavin Center
Dan M Barbasch*, Cornell University
(94722117)

Sunday October 3, 1999, 1:30 p.m.2:20 p.m.
Invited Address
The Novikov conjecture and geometry of groups.
'64 Hall, Slavin Center
Guoliang Yu*, University of Colorado, Boulder
(9471964)

Sunday October 3, 1999, 2:30 p.m.3:50 p.m.
Special Session on Representation Theory of Reductive Groups
Room 327, Harkins Hall
Organizers:
Dan M. Barbasch, Cornell University barbasch@math.cornell.edu
Birgit Speh, Cornell University speh@math.cornell.edu

2:30 p.m.
Representation theoretic structures encoded in the loop Grassmannian.
Ivan Mirkovi\'c*, University of Massachusetts at Amherst
(94722157)

3:00 p.m.
Intertwining operators and Weyl group representations.
David A Vogan*, MIT
(9472258)

3:30 p.m.
Nonvanishing Theorems for Theta Correspondence.
Hongyu L He*, Georgia State Univ.
(9472296)

Sunday October 3, 1999, 2:30 p.m.4:50 p.m.
Special Session on Geometry and Representation Theory of Algebraic Groups
Room 328, Harkins Hall
Organizers:
James E. Humphreys, University of Massachusetts jeh@math.umass.edu
Ivan Mirkovic, University of Massachusetts mirkovic@math.umass.edu

2:30 p.m.
Polar varieties in classical Lie algebras.
Mikhail Grinberg*, MIT
(9472248)

3:00 p.m.
Principal nilpotent pairs in a semisimple Lie algebra.
Victor Ginzburg*, University of Chicago
(94717110)

3:30 p.m.
Generalized character sums associated to regular prehomogeneous vector spaces over finite fields.
David Kazhdan, Harvard University
Alexander Polishchuk*, Boston University
(94714105)

4:00 p.m.
Normalized intertwining operators and crystals.
Alexander Braverman*, Massachusetts Institute of Techonology
(94722155)

4:30 p.m.
Discussion.

Sunday October 3, 1999, 2:30 p.m.4:20 p.m.
Special Session on Geometric Properties of Nonlinear Elliptic PDEs
Room 135, Albertus Magnus Hall
Organizers:
Henri Berestycki, Universit\'e Pierre et Marie Curie (Paris VI)
Yanyan Li, Rutgers University yyli@math.rutgers.edu

2:30 p.m.
On a three dimensional singularly perturbed Neumann problem.
Meijun Zhu*, The University of Oklahoma
Nassif Ghoussoub, University of British Columbia
Changfeng Gui, University of British Columbia
(9473589)

3:00 p.m.
Symmetry For Exterior Elliptic Problems and Two Conjectures In Potential Theory.
Boyan Sirakov*, Universit\'e Paris VI
(9473577)

3:30 p.m.
Nonexistence results for semilinear cooperative elliptic systems via moving spheres.
Wolfgang Reichel, Universitat Basel, Switzerland
Henghui Zou*, University of Alabama at Birmingham
(9473542)

4:00 p.m.
Traveling two and three dimensional water waves.
Walter Craig*, Brown University
(94735170)

Sunday October 3, 1999, 2:40 p.m.5:00 p.m.
Special Session on Operator KTheory and its Applications to Geometry and Topology
Room 301, Harkins Hall
Organizers:
Guoliang Yu, University of Colorado, Boulder gyu@euclid.Colorado.EDU
Carla E. Farsi, University of Colorado, Boulder farsi@euclid.colorado.edu
Jeffrey S. Fox, University of Colorado, Boulder jfox@euclid.colorado.edu

2:40 p.m.
Generalized amenability and embeddings into Hilbert space.
Alexander N Dranishnikov*, Pennsylvania State University
(9472079)

3:30 p.m.
Noncommutative geometry and the representation theory of padic groups.
Paul Baum*, Penn State University
(94719102)

4:20 p.m.
Proper Actions, Bivariant Chern Characters and the Index Theorem.
Ronghui Ji*, IUPUI
(94758167)

Sunday October 3, 1999, 2:40 p.m.4:30 p.m.
Special Session on The History of Mathematics
Room I, Moore Hall
Organizers:
Daniel Otero, Xavier University otero@xavier.xu.edu
C. Edward Sandifer, Western Connecticut State University sandifer@wcsub.ctstateu.edu

2:40 p.m.
Hensel's $p$adic numbers: early history.
Fernando Q Gouvea*, Colby College
(94701138)

3:20 p.m.
The Development of Whole Number Algorithms in the United States.
Susan C Ross*, University of Southern Mississippi
(94701146)

4:00 p.m.
How did the Pythagoreans Prove the Side of a Square is Incommensurable With Its Diagonal?
Jeff A Suzuki*, Boston University, College of General Studies
(94701119)

Sunday October 3, 1999, 2:40 p.m.5:00 p.m.
Special Session on Number Theory
Room III, Moore Hall
Organizers:
Michael I. Rosen, Brown University mrosen@math.brown.edu
Siman Wong, Brown University siman@math.brown.edu

2:40 p.m.
Tamely Ramified Towers and Discriminant Bounds for Number Fields.
Farshid Hajir*, UCLA & Cal State Univ. San Marcos
Christian Maire, Universite de Bordeaux 1
(9471170)

3:10 p.m.
padic Distributions and padic Representation Theory.
Jeremy Teitelbaum*, University of Illinois at Chicago
(9471167)

3:40 p.m.
Toric Varieties and Modular Forms.
Lev A Borisov, Columbia University
Paul E Gunnells*, Columbia University
(94711131)

4:10 p.m.
Counting elliptic curves.
Jeffrey D. Achter*, UMass Amherst
Clifton Cunningham, UMass Amherst
(9471182)

4:40 p.m.
On Greenberg's Conjecture.
David C Marshall*, University of Arizona
William G McCallum, University of Arizona
(94711164)
Inquiries: meet@ams.org