
AMS Sectional Meeting Full Program
Current as of Sunday, May 3, 2009 00:21:11
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Inquiries: meet@ams.org
2009 Spring Western Section Meeting
San Francisco, CA, April 2526, 2009 (Saturday  Sunday)
Meeting #1049
Associate secretaries: Michel L Lapidus, AMS lapidus@math.ucr.edu, lapidus@mathserv.ucr.edu
Saturday April 25, 2009

Saturday April 25, 2009, 7:30 a.m.4:00 p.m.
Meeting Registration
Third Floor Lobby, Thornton Hall

Saturday April 25, 2009, 7:30 a.m.4:00 p.m.
Exhibit and Book Sale
Room 429, Thornton Hall

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Nonlinear Partial Differential Equations, I
Room 432, Thornton Hall Organizers: Igor Kukavica, University of Southern California kukavica@usc.edu
Amjad Tuffaha, University of Southern California tuffaha@usc.edu
Mohammed Ziane, University of Southern California ziane@usc.edu

8:00 a.m.
Wellposedness and long time behavior of weak solutions to BoussinesqKirchoff equations.
Irena M Lasiecka*, University of Virginia
(104935138)

8:30 a.m.
Filtering, smoothing, and quasireversibility, and their relationship to the estimation and forecasting problems in chaotic PDE systems with diffusion.
Thomas R Bewley*, UC San Diego
(10493517)

9:00 a.m.
Global regularity for the 2D MHD equations with mixed partial dissipation and magnetic diffusion.
Jiahong Wu*, Oklahoma State University
(10493542)

9:30 a.m.
A degenerate hyperbolic freeboundary problem for 3D compressible Euler flow in physical vacuum and the method of artificial phase.
Steve Shkoller*, UC Davis
(104935154)

10:00 a.m.
Free boundary problems of the Euler equation: local wellposedness and hydrodynamical instabilities.
Jalal Shatah, New York University
Chongchun Zeng*, Georgia Institute of Technology
(104935157)

10:30 a.m.
Local Bifurcations in Random Dynamical Systems.
Mickaël David Chekroun*, Ecole Normale Supérieure
(104935193)

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Banach Algebras, Topological Algebras, and Abstract Harmonic Analysis, I
Room 425, Thornton Hall Organizers: Thomas V. Tonev, University of MontanaMissoula tonevtv@mso.umt.edu
Fereidoun Ghahramani, University of Manitoba fereidou@cc.umanitoba.ca

Saturday April 25, 2009, 8:00 a.m.10:40 a.m.
Special Session on Concentration Inequalities, I
Room 335, Thornton Hall Organizers: Sourav Chatterjee, University of California Berkeley sourav@stat.berkeley.edu
Roman Vershynin, University of California Davis vershynin@math.ucdavis.edu

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Geometry and Topology of Orbifolds, I
Room 210, Thornton Hall Organizers: Elizabeth Stanhope, Lewis & Clark University stanhope@lclark.edu
Joseph E. Borzellino, California State University San Luis Obispo jborzell@calpoly.edu

8:00 a.m.
Applications of heat invariants to 2orbifolds.
Sarah J Greenwald*, Appalachian State University
Emily Dryden, Bucknell University
Carolyn Gordon, Dartmouth College
David Webb, Dartmouth College
(104953178)

8:30 a.m.
Geodesics on weighted projective spaces.
Victor Guillemin, MIT
Alejandro Uribe, University of Michgan
Zuoqin Wang*, Johns Hopkins University
(104958135)

9:00 a.m.
Bounds on 2orbifold diffeomorphism type.
Emily B. Proctor*, Middlebury College
Elizabeth A. Stanhope, Lewis & Clark College
(104953103)

9:30 a.m.
Cohomogeneity 3 Actions on the Sphere.
J. McGowan*, Howard University
C. Searle, Instituto de Matematicas Unidad CuernavacaUNAM
(10495397)

10:00 a.m.
Nonnegatively curved manifolds with maximal symmetry rank in low dimensions.
Catherine E Searle*, IMATEUNAM Cuernavaca
Fernando GalazGarcia, U Maryland College Park
(104953158)

10:30 a.m.
Connections between singular spaces: leaf spaces of Riemannian manifolds and orbifolds.
Mary R Sandoval*, Trinity College
(104958105)

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Matroids in Algebra and Geometry, I
Room 113, Hensill Hall Organizers: Federico Ardila, San Francisco State University federico@math.sfsu.edu
Lauren Williams, Harvard University lauren@math.harvard.edu

8:00 a.m.
How to draw a tropical plane.
Sven Hermann, Technical University Darmstadt, Germany
Anders Jensen, University of Gottingen, Germany
Michael Joswig, Technical University Darmstadt, Germany
Bernd Sturmfels*, University of California at Berkeley
(10490518)

9:00 a.m.
Cellular resolutions of monomial ideals from coarse tropical type decompositions.
Anton Dochtermann*, TU Berlin
Michael Joswig, TU Darmstadt
Raman Sanyal, UC Berkeley
(104905179)

10:00 a.m.
Valuations for matroid polytope subdivisions.
Federico Ardila, San Francisco State University
Alex Fink, University of California, Berkeley
Felipe Rincon*, University of California, Berkeley
(104905112)

10:30 a.m.
Universality for valuations of matroid polytope subdivisions.
Alex R Fink*, UC Berkeley
(104905116)

Saturday April 25, 2009, 8:00 a.m.10:40 a.m.
Special Session on Aspects of Differential Geometry, I
Room 325, Thornton Hall Organizers: David Bao, San Francisco State University bao@math.sfsu.edu
Lei Ni, University of California San Diego lni.math.ucsd@gmail.com

Saturday April 25, 2009, 8:30 a.m.10:50 a.m.
Special Session on Applications of Knot Theory to the Entanglement of Biopolymers, I
Room 210, Science Building Organizers: Javier Arsuaga, San Francisco State University jarsuaga@sfsu.edu
Kenneth Millett, University of California Santa Barbara millett@math.ucsb.edu
Mariel Vazquez, San Francisco State University mariel@math.sfsu.edu

Saturday April 25, 2009, 8:30 a.m.10:50 a.m.
Special Session on Algebra and Number Theory with Polyhedra, I
Room 108, Hensill Hall Organizers: Matthias Beck, San Francisco State University beck@math.sfsu.edu
Christian Haase, Freie Universität Berlin Christian.Haase@math.fuberlin.de

8:30 a.m.
Volumes of matroid polytopes.
Federico Ardila, SFSU
Carolina Benedetti, Universidad de los Andes
Jeffrey Doker*, UC Berkeley
(10490590)

9:00 a.m.
Bounds on lattice polygons and the classification of toric log Del Pezzo surfaces.
Alexander M. Kasprzyk, IMSAS, University of Kent
Maximilian Kreuzer, Institute for Theoretical Physics, Vienna University of Technology
Benjamin Nill*, Institute of Mathematics, Freie Universitaet Berlin
(104952143)

9:30 a.m.
Lattice Polytopes in polymake.
Michael Joswig, TU Darmstadt
Benjamin Mueller, FU Berlin
Andreas Paffenholz*, FU Berlin
(104905145)

10:00 a.m.
btransshipments, modular flow reciprocity, and a combinatorial interpretation of the Tutte polynomial.
Raman Sanyal*, University of California, Berkeley
(104905211)

10:30 a.m.
The balanced minimum evolution polytopes.
Ruriko Yoshida*, University of Kentucky
(10490579)

Saturday April 25, 2009, 9:00 a.m.10:40 a.m.
Special Session on Lie group actions, Teichmüller Flows and Number Theory, I
Room 329, Thornton Hall Organizers: Jayadev Athreya, Yale University jayadev.athreya@yale.edu
Yitwah Cheung, San Francisco State University cheung@math.sfsu.edu
Anton Zorich, Rennes University Anton.Zorich@univrennes1.fr

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on Recent Progress in Geometric Group Theory, I
Room 327, Thornton Hall Organizers: Seonhee Lim, Cornell University slim@math.cornell.edu)
Anne Thomas, Cornell University athomas@math.cornell.edu

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on Nonlinear Dispersive Equations, I
Room 409, Thornton Hall Organizers: Sebastian Herr, University of California Berkeley herr@math.berkeley.edu
Jeremy L. Marzuola, Columbia University jm3058@columbia.edu

Saturday April 25, 2009, 9:30 a.m.10:50 a.m.
Special Session on Advances in the Theory of Integer Linear Optimization and its Extensions, I
Room 206, Hensill Hall Organizers: Matthias Koeppe, University of California Davis mkoeppe@math.ucdavis.edu
Peter Malkin, University of California Davis malkin@math.ucdavis.edu

Saturday April 25, 2009, 11:10 a.m.12:00 p.m.
Invited Address
Asymptotic properties of finite groups and finitedimensional algebras.
Room 201, Science Building
Efim Zelmanov*, University of California San Diego
(10491704)

Saturday April 25, 2009, 2:00 p.m.2:50 p.m.
Invited Address
Concentration of measure, convex geometry and random matrices.
Room 201, Science Building
Roman Vershynin*, University of Michigan
(10496002)

Saturday April 25, 2009, 3:00 p.m.5:20 p.m.
Special Session on Applications of Knot Theory to the Entanglement of Biopolymers, II
Room 210, Science Building Organizers: Javier Arsuaga, San Francisco State University jarsuaga@sfsu.edu
Kenneth Millett, University of California Santa Barbara millett@math.ucsb.edu
Mariel Vazquez, San Francisco State University mariel@math.sfsu.edu

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Algebra and Number Theory with Polyhedra, II
Room 108, Hensill Hall Organizers: Matthias Beck, San Francisco State University beck@math.sfsu.edu
Christian Haase, Freie Universität Berlin Christian.Haase@math.fuberlin.de

3:00 p.m.
Average Behavior of the Frobenius Numbers.
Iskander Aliev, Cardiff University
Martin Henk*, Universitaet Magdeburg
(10495284)

3:30 p.m.
Tiling lattices with translates of sublattices.
Sinai Robins*, Nanyang Technological University
James Propp, University of Massachussetts, Lowell
(104952152)

4:00 p.m.
Growth series of cyclotomic and root lattices.
Serkan Hosten*, San Francisco State University Mathematics Department
(104905190)

4:30 p.m.
A Finite Calculus Approach to Ehrhart Polynomials.
Kevin Woods*, Oberlin College
(104905188)

5:00 p.m.
Weighted Ehrhart Theory.
Alan Michael Stapledon*, University of Michigan
(10490535)

5:30 p.m.
Nowhere harmonic colorings of graphs.
Benjamin J Braun*, University of Kentucky
Matthias Beck, San Francisco State University
(104905113)

Saturday April 25, 2009, 3:00 p.m.4:40 p.m.
Special Session on Lie group actions, Teichmüller Flows and Number Theory, II
Room 329, Thornton Hall Organizers: Jayadev Athreya, Yale University jayadev.athreya@yale.edu
Yitwah Cheung, San Francisco State University cheung@math.sfsu.edu
Anton Zorich, Rennes University Anton.Zorich@univrennes1.fr

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Nonlinear Partial Differential Equations, II
Room 432, Thornton Hall Organizers: Igor Kukavica, University of Southern California kukavica@usc.edu
Amjad Tuffaha, University of Southern California tuffaha@usc.edu
Mohammed Ziane, University of Southern California ziane@usc.edu

3:00 p.m.
Semigroupwellposedness, strong and uniform stability of a hyperbolicparabolic StokesLame fluidstructure interaction model.
Roberto Triggiani*, Mathematics Department, U of Virginia
(104935191)

3:30 p.m.
The quintic NLS as the mean field limit of a Boson gas with threebody interactions.
Thomas Chen, University of Texas at Austin
Natasa Pavlovic*, University of Texas at Austin
(10493525)

4:00 p.m.
Commuting conditional expectations and nonlinear evolution.
Alexandre J. Chorin*, University of California, Berkeley.
(10493561)

4:30 p.m.
Vanishing viscosity and the accumulation of vorticity on the boundary.
James P Kelliher*, University of Caifornia, Riverside
(104976161)

5:00 p.m.
AeroElastic Stability in Viscous Flow.
A. V, Balakrishnan*, University of California Los AngelesUCLA
(10493548)

5:30 p.m.
Discussion

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Banach Algebras, Topological Algebras, and Abstract Harmonic Analysis, II
Room 425, Thornton Hall Organizers: Thomas V. Tonev, University of MontanaMissoula tonevtv@mso.umt.edu
Fereidoun Ghahramani, University of Manitoba fereidou@cc.umanitoba.ca

3:00 p.m.
Transformations on the space of positive operators.
Lajos Molnar*, University of Debrecen
(10494686)

3:30 p.m.
Peripheral Multiplicativity and Isomorphisms Between Standard Operator Algebras.
Thomas Tonev, University of Montana
Aaron Luttman*, Clarkson University
(10494715)

4:00 p.m.
NormLinear and NormAdditive Operators Between Uniform Algebras.
Thomas Tonev, University of Montana
Rebekah Yates*, University of Montana
(104946162)

4:30 p.m.
Biflatness and biprojectivity of the Fourier algebra.
Volker Runde*, University of Alberta
(10494387)

5:00 p.m.
Approximate amenability of Beurling algebras.
Yong Zhang*, Department of Mathematics, University of Manitoba
(104946117)

5:30 p.m.
Unitary representations and the Eberlein compactification of a locally compact group.
Nico Spronk, University of Waterloo
Ross Stokke*, University of Winnipeg
(104943132)

Saturday April 25, 2009, 3:00 p.m.5:20 p.m.
Special Session on Recent Progress in Geometric Group Theory, II
Room 327, Thornton Hall Organizers: Seonhee Lim, Cornell University slim@math.cornell.edu)
Anne Thomas, Cornell University athomas@math.cornell.edu

3:00 p.m.
Rank 2 nondiscrete affine buildings.
Arkady Berenstein, Department of Mathematics, University of Oregon
Michael Kapovich*, Department of Mathematics, University of California, Davis
(10495198)

4:00 p.m.
Commensurability and unfoldings of uniform lattices in rightangled buildings.
Angela Kubena Barnhill*, Northwestern University
Anne Thomas, Cornell University
(104920207)

4:30 p.m.
The $\ell^2$invariants of clean 2complexes.
Ethan Berkove, Lafayette College
Sejal Dharia, San José State University
Tim Hsu*, San José State University
(104920200)

5:00 p.m.
Unusual Geodesics in Generalizations of Thompson's Group.
Claire Wladis*, BMCC/CUNY
(10492011)

Saturday April 25, 2009, 3:00 p.m.5:40 p.m.
Special Session on Concentration Inequalities, II
Room 335, Thornton Hall Organizers: Sourav Chatterjee, University of California Berkeley sourav@stat.berkeley.edu
Roman Vershynin, University of California Davis vershynin@math.ucdavis.edu

Saturday April 25, 2009, 3:00 p.m.5:20 p.m.
Special Session on Nonlinear Dispersive Equations, II
Room 409, Thornton Hall Organizers: Sebastian Herr, University of California Berkeley herr@math.berkeley.edu
Jeremy L. Marzuola, Columbia University jm3058@columbia.edu

3:00 p.m.
A system of ODEs for a Perturbation of a Minimal Mass Soliton.
Jeremy Marzuola, Columbia University and Bonn University
Sarah Raynor*, Wake Forest University
Gideon Simpson, University of Toronto
Catherine Sulem, University of Toronto
(10493516)

3:30 p.m.
Soliton evolution in the Hartree equation with slowly varying potential.
Kiril Datchev*, University of California, Berkeley
Ivan Ventura, University of California, Berkeley
(104935123)

4:00 p.m.
A CentreStable Manifold in $H^{1/2}$ for the $H^{1/2}$ Critical NLS.
Marius Beceanu*, University of Chicago
(104935111)

4:30 p.m.
Stable Directions for Degenerate Excited States of Nonlinear Schrödinger Equations.
Stephen Gustafson, University of British Columbia
Tuoc Van Phan*, University of British Columbia
(104935174)

5:00 p.m.
Abstract Strichartz estimates and the Strauss conjecture for the wave equation in exterior domains.
Jason Metcalfe*, University of North Carolina
(104935183)

Saturday April 25, 2009, 3:00 p.m.4:50 p.m.
Special Session on Geometry and Topology of Orbifolds, II
Room 210, Thornton Hall Organizers: Elizabeth Stanhope, Lewis & Clark University stanhope@lclark.edu
Joseph E. Borzellino, California State University San Luis Obispo jborzell@calpoly.edu

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Advances in the Theory of Integer Linear Optimization and its Extensions, II
Room 206, Hensill Hall Organizers: Matthias Koeppe, University of California Davis mkoeppe@math.ucdavis.edu
Peter Malkin, University of California Davis malkin@math.ucdavis.edu

3:00 p.m.
Parametric Nonlinear Discrete Optimization.
Jon Lee*, IBM TJ Watson Research Center
(10499024)

3:30 p.m.
SDP representation of convex sets.
Jiawang Nie*, University of California, San Diego
J. William Helton, University of California, San Diego
(104990115)

4:00 p.m.
A new SDP approach to the MaxCut problem.
Joao Gouveia*, University of Washington
Monique Laurent, Centrum Wiskunde & Informatica (CWI)
Pablo A Parrilo, Massachusetts Institute of Technology
Rekha R Thomas, University of Washington
(10499038)

4:30 p.m.
Conic lifting.
Alper Atamturk*, UC Berkeley
Vishnu Narayanan, IIT Bombay
(10499032)

5:00 p.m.
Computing Infeasibility Certificates for Combinatorial Problems via Hilbert's Nullstellensatz.
J.A. De Loera, University of California, Davis
Jon Lee, IBM T.J. Watson Research Center, Yorktown Heights, NY
Peter N. Malkin, University of California, Davis
Susan Margulies*, Rice University
(104905185)

5:30 p.m.
Gauging feasibility of integer linear programs.
Jesus A De Loera*, University of California, Davis
(104990203)

Saturday April 25, 2009, 3:00 p.m.5:40 p.m.
Special Session on Matroids in Algebra and Geometry, II
Room 113, Hensill Hall Organizers: Federico Ardila, San Francisco State University federico@math.sfsu.edu
Lauren Williams, Harvard University lauren@math.harvard.edu

Saturday April 25, 2009, 3:00 p.m.5:40 p.m.
Special Session on Aspects of Differential Geometry, II
Room 325, Thornton Hall Organizers: David Bao, San Francisco State University bao@math.sfsu.edu
Lei Ni, University of California San Diego lni.math.ucsd@gmail.com

Saturday April 25, 2009, 3:00 p.m.5:55 p.m.
Contributed Paper Session
Room 428, Thornton Hall

3:00 p.m.
Stability of Nonlinear Differential Equations.
rod freed*, California State University
(104937128)

3:15 p.m.
Cell Discovery in Networks with Transient Links.
Thomas J Emerson*, Eigenvector Consulting
(104968204)

3:30 p.m.
A Discrete Pharmacokinetics Compartmental Model.
Mostafa Ghandehari*, University of Texas at Arlington
Shiva Keramati, none
(10491509)

3:45 p.m.
The Numerical Solution for the Exterior Dirichlet Problem for the Helmholtz Equation via the Jones integral equation approach specifically for the 'peanut' shape.
Yajni M. Warnapala, Roger Williams University
Elizabeth Morgan*, Roger Williams University
(104945104)

4:00 p.m.
The enveloping algebra of the PetrogradskyShestakovZelmanov algebra is not gradednil in the critical characteristics.
Ya. S. Krylyuk*, De Anza College
(10491747)

4:15 p.m.
Powered sums as linear combinations of binomial coefficients.
Hungping Tsao*, Novato, California
(10491105)

4:30 p.m.
How to Differentiate an Integer Modulo n.
Anthony Shaheen*, California State University Los Angeles
Caleb Emmons, Pacific University
Mike Krebs, California State University Los Angeles
(10490012)

4:45 p.m.
The Kauffman Polynomials of Pretzel Knots and Rational Knots.
Jianyuan Kathy Zhong*, California State University Sacramento
Bin Lu, California State University Sacramento
(104957153)

5:00 p.m.
A sufficient condition for intrinsic knotting of bipartite graphs.
Sophy Huck, California State University, Chico
Alexandra Appel, California State University, Chico
MiguelAngel Manrique, University of South California
Thomas W Mattman*, Califorina State University, Chico
(10495763)

5:15 p.m.
Exponential Attractors for Reversible Cubic Autocatalytic ReactionDiffusion Systems.
Yuncheng You*, University of South Florida
(10493510)

5:30 p.m.
AHarmonic Equations for Differential Forms.
Shusen Ding*, Seattle University
(10493513)

5:45 p.m.
On the Leitmann equivalent problem approach.
Florian Wagener*, Universiteit van Amsterdam, The Netherlands
(10494906)
Sunday April 26, 2009

Sunday April 26, 2009, 7:30 a.m.12:00 p.m.
Meeting Registration
Third Floor Lobby, Thornton Hall

Sunday April 26, 2009, 7:30 a.m.12:00 p.m.
Exhibit and Book Sale
Room 429, Thornton Hall

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Algebra and Number Theory with Polyhedra, III
Room 108, Hensill Hall Organizers: Matthias Beck, San Francisco State University beck@math.sfsu.edu
Christian Haase, Freie Universität Berlin Christian.Haase@math.fuberlin.de

8:00 a.m.
Points of small height missing a union of varieties.
Lenny Fukshansky*, Claremont McKenna College
(10491195)

8:30 a.m.
52 years of the Hirsch conjecture.
Francisco Santos*, Universidad de Cantabria
(104952209)

9:00 a.m.
Subgraph Isomorphism through Polynomial Ideals and their relaxations.
Jesus A De Loera*, Dept. of Mathematics, University of California, Davis
(104952202)

9:30 a.m.
Combinatorial bounds on nef cones.
Diane Maclagan*, University of Warwick
(10491481)

10:00 a.m.
Theta bodies for Polynomial Ideals.
Rekha Thomas*, University of Washington
Joao Gouveia, University of Washington
Pablo Parrilo, MIT
(10495244)

10:30 a.m.
Searching for Solution Curves of Polynomial Systems.
Jan Verschelde*, University of Illinois at Chicago
(104952164)

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Nonlinear Partial Differential Equations, III
Room 432, Thornton Hall Organizers: Igor Kukavica, University of Southern California kukavica@usc.edu
Amjad Tuffaha, University of Southern California tuffaha@usc.edu
Mohammed Ziane, University of Southern California ziane@usc.edu

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Banach Algebras, Topological Algebras, and Abstract Harmonic Analysis, III
Room 425, Thornton Hall Organizers: Thomas V. Tonev, University of MontanaMissoula tonevtv@mso.umt.edu
Fereidoun Ghahramani, University of Manitoba fereidou@cc.umanitoba.ca

8:00 a.m.
Isometries between the groups of invertible elements in Banach algebras.
Osamu Hatori*, Department of Mathematics, Faculty of Sciences, Niigata University
(104946102)

8:30 a.m.
Peripherally multiplicative surjections between uniform algebras.
Miura Takeshi*, Yamagata University
(104946206)

9:00 a.m.
Norm Conditions for Uniform Algebra Isomorphisms.
Aaron Luttman, Clarkson University
Scott Lambert*, Colby College
(104946197)

9:30 a.m.
Amenability properties of centres of group algebras.
A. Azimifard, Fields Institute
E. Samei, University of Saskatchewan
N. Spronk*, University of Waterloo
(104946129)

10:00 a.m.
Contraction subgroups of locally compact groups.
George Alver Willis*, University of Newcastle
(104946141)

10:30 a.m.
Projectivity of modules over Segal algebras.
Brian Forrest, University of Waterloo, Canada
Hun Hee Lee, Chungbuk National University, Korea
Ebrahim Samei*, University of Saskatchewan, Canada
(10494380)

Sunday April 26, 2009, 8:00 a.m.10:40 a.m.
Special Session on Concentration Inequalities, III
Room 335, Thornton Hall Organizers: Sourav Chatterjee, University of California Berkeley sourav@stat.berkeley.edu
Roman Vershynin, University of California Davis vershynin@math.ucdavis.edu

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Geometry and Topology of Orbifolds, III
Room 210, Thornton Hall Organizers: Elizabeth Stanhope, Lewis & Clark University stanhope@lclark.edu
Joseph E. Borzellino, California State University San Luis Obispo jborzell@calpoly.edu

8:00 a.m.
Orbifolds and blowing up.
Emily B. Dryden*, Bucknell University
(104958189)

8:30 a.m.
Higher Index Theorems For Orbifolds.
Markus J Pflaum*, University of Colorado at Boulder
Hessel Posthuma, Kortewegde Vries Institute, Universiteit van Amsterdam, The Netherlands
Xiang Tang, Washington University, St. Louis
(10495859)

9:00 a.m.
Cobordisms of Orbifolds.
Andres Angel*, Hausdorff Center for Mathematics
(10495566)

9:30 a.m.
Diameters of spherical $3$orbifolds.
William D. Dunbar*, Bard College at Simon's Rock
Sarah J. Greenwald, Appalachian State University
Jill McGowan, Howard University
Catherine Searle, Universidad Nacional Autónoma de México
(10495355)

10:00 a.m.
On Volumes of Hyperbolic 4Orbifolds.
Ilesanmi Adeboye*, University of California, Santa Barbara
(10495764)

10:30 a.m.
What is an orbifold graph, and what do they sound like?
Karsten Gimre, Pacific University
Indra Shottland, New College of Florida
Elizabeth Stanhope*, Lewis & Clark College
(104905136)

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Matroids in Algebra and Geometry, III
Room 113, Hensill Hall Organizers: Federico Ardila, San Francisco State University federico@math.sfsu.edu
Lauren Williams, Harvard University lauren@math.harvard.edu

8:00 a.m.
Discussion

9:00 a.m.
Quasisymmetric functions and decomposability of matroid polytopes.
Kurt W. Luoto*, University of Washington, Seattle, WA
(10490549)

9:30 a.m.
Oriented Matroids and the Geometry of Visibility.
R Basri, Weizmann Institute
P Felzenszwalb, University of Chicago
R Girshick, University of Chicago
D Jacobs, University of Maryland
C Klivans*, University of Chicago
(104905151)

10:30 a.m.
Tensors, Products, and Tutte Polynomials.
Andrew Berget*, University of Minnesota
(10490593)

Sunday April 26, 2009, 8:00 a.m.10:40 a.m.
Special Session on Aspects of Differential Geometry, III
Room 325, Thornton Hall Organizers: David Bao, San Francisco State University bao@math.sfsu.edu
Lei Ni, University of California San Diego lni.math.ucsd@gmail.com

Sunday April 26, 2009, 8:30 a.m.10:50 a.m.
Special Session on Applications of Knot Theory to the Entanglement of Biopolymers, III
Room 210, Science Building Organizers: Javier Arsuaga, San Francisco State University jarsuaga@sfsu.edu
Kenneth Millett, University of California Santa Barbara millett@math.ucsb.edu
Mariel Vazquez, San Francisco State University mariel@math.sfsu.edu

8:30 a.m.
Selfavoiding knots.
Alexander Y Grosberg*, Department of Physics and Center for Soft Matter Research, New York University
(10495483)

9:30 a.m.
The Ropelengths of Knots Are Almost Linear in Terms of Their Crossing Numbers: Part 1.
Yuanan Diao*, Department of Mathematics and Statistics, UNC Charlotte
Ernst Claus, Department of Mathematics, Western Kentucky University
Attila Por, Department of Mathematics, Western Kentucky University
Uta Ziegler, Department of Computer Science, Western Kentucky University
(10495776)

10:00 a.m.
The Ropelengths of Knots Are Almost Linear in Terms of Their Crossing Numbers: Part 2.
Yuanan Diao, Department of Mathematics and Statistics, UNC Charlotte
Ernst Claus*, Department of Mathematics, Western Kentucky University
Attila Por, Department of Mathematics, Western Kentucky University
Uta Ziegler, Department of Computer Science, Western Kentucky University
(10495777)

10:30 a.m.
A chain of linked ring polymers in solution via Brownian dynamics.
Tetsuo Deguchi*, Department of Physics, Graduate School of Humanities and Sciences, Ochanomizu University
Naoko Kanaeda, Department of Physics, Graduate School of Humanities and Sciences, Ochanomizu University
(10498282)

Sunday April 26, 2009, 8:30 a.m.10:50 a.m.
Special Session on Recent Progress in Geometric Group Theory, III
Room 327, Thornton Hall Organizers: Seonhee Lim, Cornell University slim@math.cornell.edu)
Anne Thomas, Cornell University athomas@math.cornell.edu

Sunday April 26, 2009, 8:30 a.m.10:50 a.m.
Special Session on Advances in the Theory of Integer Linear Optimization and its Extensions, III
Room 206, Hensill Hall Organizers: Matthias Koeppe, University of California Davis mkoeppe@math.ucdavis.edu
Peter Malkin, University of California Davis malkin@math.ucdavis.edu

8:30 a.m.
Parametric integer programming in fixed dimension.
Friedrich Eisenbrand*, EPFL
Gennady Shmonin, EPFL
(10499426)

9:30 a.m.
Computing pure Nash equilibria in games with piecewise linear utilities.
Christopher Thomas Ryan*, Sauder School of Business, University of British Columbia
Matthias Koeppe, University of California, Davis, Department of Mathematics
Albert Xin Jiang, University of British Columbia, Department of Computer Science
Kevin LeytonBrown, University of British Columbia, Department of Computer Science
Maurice Queyranne, Sauder School of Business, British Columbia
(10499157)

10:00 a.m.
Complexity and equilibria in congestion games.
Carol Meyers*, Lawrence Livermore National Laboratory
Andreas S. Schulz, Massachusetts Institute of Technology
(10499050)

10:30 a.m.
An Integer Set Library for Program Analysis.
Sven Verdoolaege*, Katholieke Universiteit Leuven, Department of Computer Science
(10495246)

Sunday April 26, 2009, 9:00 a.m.10:40 a.m.
Special Session on Lie group actions, Teichmüller Flows and Number Theory, III
Room 329, Thornton Hall Organizers: Jayadev Athreya, Yale University jayadev.athreya@yale.edu
Yitwah Cheung, San Francisco State University cheung@math.sfsu.edu
Anton Zorich, Rennes University Anton.Zorich@univrennes1.fr

Sunday April 26, 2009, 9:00 a.m.10:50 a.m.
Special Session on Nonlinear Dispersive Equations, III
Room 409, Thornton Hall Organizers: Sebastian Herr, University of California Berkeley herr@math.berkeley.edu
Jeremy L. Marzuola, Columbia University jm3058@columbia.edu

Sunday April 26, 2009, 11:10 a.m.12:00 p.m.
Invited Address
Actions of automorphism groups of free groups.
Room 201, Science Building
Karen Vogtmann*, Cornell University
(10492003)

Sunday April 26, 2009, 2:00 p.m.2:50 p.m.
Invited Address
Bounded generation of arithmetic groups and some recent applications.
Room 201, Science Building
Yehuda Shalom*, University of California Los Angeles
(10490001)

Sunday April 26, 2009, 3:00 p.m.4:50 p.m.
Special Session on Applications of Knot Theory to the Entanglement of Biopolymers, IV
Room 210, Science Building Organizers: Javier Arsuaga, San Francisco State University jarsuaga@sfsu.edu
Kenneth Millett, University of California Santa Barbara millett@math.ucsb.edu
Mariel Vazquez, San Francisco State University mariel@math.sfsu.edu

3:00 p.m.
'4string tangle analysis of DNAprotein complexes'.
soojeong kim*, university of iowa
isabel darcy, university of iowa
(104957208)

3:30 p.m.
Exponential Growth of the Number of $n$edge Linked Clusters in $\mathbb{Z}^3$ and the Consequences in Entanglement Percolation.
Mahshid Atapour*, Department of Mathematics and Statistics, York University
(104905187)

4:00 p.m.
Upper Bound for the Ropelength of a Trefoil Knot.
Teresita RamirezRosas*, University of California, Santa Barbara
(104954192)

4:30 p.m.
A fast ergodic algorithm for generating ensembles of equilateral random polygons.
R Varela*, Department of Computer Science, San Francisco State University, 1600 Holloway Ave, San Francisco, CA 94132, USA
K Hinson, Department of Mathematics and Statistics, University of North Carolina at Charlotte Charlotte, NC 28223, USA
J Arsuaga, Department of Mathematics, San Francisco State University, 1600 Holloway Ave, San Francisco, CA 94132, USA
Y Diao, Department of Mathematics and Statistics, University of North Carolina at Charlotte Charlotte, NC 28223, USA
(104954125)

Sunday April 26, 2009, 3:00 p.m.5:50 p.m.
Special Session on Algebra and Number Theory with Polyhedra, IV
Room 108, Hensill Hall Organizers: Matthias Beck, San Francisco State University beck@math.sfsu.edu
Christian Haase, Freie Universität Berlin Christian.Haase@math.fuberlin.de

3:00 p.m.
Toric specializations of the Rees algebra of Koszul cycles.
H. Schenck*, University of Illinois UrbanaChampaign
M Stillman, Math Dept, Cornell Univ.
(104914146)

3:30 p.m.
Hom, tenzor, Ker, and Coker constructions for polytopes.
Joseph Gubeladze*, San Francisco State University
(104952108)

4:00 p.m.
Toric ideals of nested configurations.
Hidefumi Ohsugi*, Rikkyo University (JST CREST)
(104913147)

4:30 p.m.
The caterpillar polytope and its relatives.
Milena Hering*, University of Utah/MSRI
Benjamin Howard, University of Michigan
(104914166)

5:00 p.m.
Frobenius splittings for lattice polytopes.
Sam Payne*, Stanford Universty and Clay Mathematics Institute
(104905165)

5:30 p.m.
On the Lefschetz Property for Vernonese Rings.
Volkmar Welker*, PhilippsUniversität Marburg
Martina Kubitzke, PhlippsUniversität Marburg
(104905142)

Sunday April 26, 2009, 3:00 p.m.4:40 p.m.
Special Session on Lie group actions, Teichmüller Flows and Number Theory, IV
Room 329, Thornton Hall Organizers: Jayadev Athreya, Yale University jayadev.athreya@yale.edu
Yitwah Cheung, San Francisco State University cheung@math.sfsu.edu
Anton Zorich, Rennes University Anton.Zorich@univrennes1.fr

Sunday April 26, 2009, 3:00 p.m.5:50 p.m.
Special Session on Nonlinear Partial Differential Equations, IV
Room 432, Thornton Hall Organizers: Igor Kukavica, University of Southern California kukavica@usc.edu
Amjad Tuffaha, University of Southern California tuffaha@usc.edu
Mohammed Ziane, University of Southern California ziane@usc.edu

3:00 p.m.
A Priori Bounds for the Vorticity of Axis Symmetric Solutions to the NavierStokes Equations.
Qi S. Zhang*, Math. Dept. UC Riverside
Jenn Burke, Math. Dept. UC Riverside
(104935167)

3:30 p.m.
On the global attractor for the 3D NavierStokes equations.
Alexey Cheskidov*, University of Illinois at Chicago
(104935210)

4:00 p.m.
Stochastic Lagrangian Particle systems for the NavierStokes and Burgers equations.
Peter Constantin, University of Chicago
Gautam Iyer*, Stanford University
Jonathan C. Mattingly, Duke University
Alexei Novikov, Pennsylvania State University
(10497645)

4:30 p.m.
The 2D NavierStokesVoight and 2D damped NavierStokes equations for image inpainting.
Moe Ebrahimi, University of California, San Diego
Michael Holst, University of California, San Diego
Evelyn M. Lunasin*, University of California San Diego
Edriss S. Titi, University of California Irvine and Weizmann Institute of Science, Israel
(104976122)

5:00 p.m.
Inertial manifolds for a class of Burgers' and nonlinear FokkerPlanck equations.
Jesenko Vukadinovic*, College of Staten Island and the Graduate Center of CUNY
(104935194)

5:30 p.m.
Elliptic and parabolic equations with partially BMO coefficients in Sobolev spaces.
Doyoon Kim*, University of Southern California
(104935175)

Sunday April 26, 2009, 3:00 p.m.4:50 p.m.
Special Session on Banach Algebras, Topological Algebras, and Abstract Harmonic Analysis, IV
Room 425, Thornton Hall Organizers: Thomas V. Tonev, University of MontanaMissoula tonevtv@mso.umt.edu
Fereidoun Ghahramani, University of Manitoba fereidou@cc.umanitoba.ca

Sunday April 26, 2009, 3:00 p.m.4:20 p.m.
Special Session on Recent Progress in Geometric Group Theory, IV
Room 327, Thornton Hall Organizers: Seonhee Lim, Cornell University slim@math.cornell.edu)
Anne Thomas, Cornell University athomas@math.cornell.edu

Sunday April 26, 2009, 3:00 p.m.5:40 p.m.
Special Session on Concentration Inequalities, IV
Room 335, Thornton Hall Organizers: Sourav Chatterjee, University of California Berkeley sourav@stat.berkeley.edu
Roman Vershynin, University of California Davis vershynin@math.ucdavis.edu

Sunday April 26, 2009, 3:00 p.m.5:20 p.m.
Special Session on Advances in the Theory of Integer Linear Optimization and its Extensions, IV
Room 206, Hensill Hall Organizers: Matthias Koeppe, University of California Davis mkoeppe@math.ucdavis.edu
Peter Malkin, University of California Davis malkin@math.ucdavis.edu

Sunday April 26, 2009, 3:00 p.m.5:40 p.m.
Special Session on Matroids in Algebra and Geometry, IV
Room 113, Hensill Hall Organizers: Federico Ardila, San Francisco State University federico@math.sfsu.edu
Lauren Williams, Harvard University lauren@math.harvard.edu

Sunday April 26, 2009, 3:00 p.m.
Special Session on Aspects of Differential Geometry, IV
Room 325, Thornton Hall Organizers: David Bao, San Francisco State University bao@math.sfsu.edu
Lei Ni, University of California San Diego lni.math.ucsd@gmail.com
Inquiries: meet@ams.org

