AMS Sectional Meeting Program by Day
Current as of Sunday, May 3, 2009 00:21:11
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
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)

8:00 a.m.

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

8:00 a.m.
Questions on steady state NavierStoke equations.
Maria Elena Schonbek*, UCSC
Clayton BJorland, bjorland@math.utexas.edu
(104935171) 
8:30 a.m.
Attractor and inertialmanifold results for the 3D spectrallyhyperviscous NavierStokes equations.
Joel Avrin*, University of North Carolina at Charlotte
(104976124) 
9:00 a.m.
Localization of vortexstretching in the 3D NSE.
Zoran Grujic*, University of Virginia
(10493573) 
9:30 a.m.
Global Wellposedness for the 2D Boussinesq Equations with Fractional Dissipation.
Ning Ju*, Oklahoma State University
(104935173) 
10:00 a.m.
Remarks on the boundary layers for the NavierStokes equations in bounded domains.
GungMin Gie, Indiana University
Makram Hamouda*, Indiana University
Roger Temam, Indiana University
(104976182) 
10:30 a.m.
New WellPosedness Results for the Equations of Stochastic Fluid Dynamics with Multiplicative Noise.
Nathan E GlattHoltz*, Indiana University
(104935196)

8:00 a.m.

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)

8:00 a.m.

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

8:00 a.m.
Concentration of functionals of random matrices.
Mark Meckes*, Case Western Reserve University
(104960186) 
9:00 a.m.
Small ball probability estimates, $\psi_2$behavior and the hyperplane conjecture.
Nikos Dafnis, Department of Mathematics, University of Athens
Grigorios Paouris*, Texas A & M University
(10495288) 
10:00 a.m.
{\bf Bounding relative entropy between measures on product spaces\newline by the relative entropy between local specifications}.
Katalin Marton*, Alfréd Rényi Institute of Mathematics, Budapest
(10496033)

8:00 a.m.

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)

8:00 a.m.

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)

8:00 a.m.

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

8:00 a.m.
The Structure of Complete Manifolds with Positive Spectrum.
Ovidiu Munteanu*, Columbia University, New York
(10495340) 
9:00 a.m.
Geometric Meanings of Curvatures in Finsler Geometry.
Zhongmin Shen*, Indiana University Purdue University Indianapolis
(10495369) 
10:00 a.m.
Mean curvature flows of Lagrangian graphs and isotopy problems.
MuTao Wang*, Department of Mathematics, Columbia University
(10495356)

8:00 a.m.

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)

8:30 a.m.

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

8:30 a.m.
Dehn functions of linear groups.
Kevin Wortman*, University of Utah
(104920201) 
9:00 a.m.
Discussion 
9:30 a.m.
Sequences of Unfaithful Representations into PSL(2,C).
Ian Biringer*, University of Chicago
Juan Souto, University of Michigan
(104951180) 
10:00 a.m.
Discussion 
10:30 a.m.
Discussion

8:30 a.m.

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)

8:30 a.m.

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

9:00 a.m.
Completed cycles and singularities of stable maps.
Dimitri Zvonkine*, CNRS, visiting Stanford University
(104914177) 
10:00 a.m.
Badly approximable systems of affine forms, fractals, and Schmidt games.
Manfred Einsiedler, The Ohio State University
Jimmy Tseng*, The Ohio State University
(104911163)

9:00 a.m.

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

9:00 a.m.
Strichartz estimates for the Schrödinger equation in exterior domains.
Matthew D Blair*, University of New Mexico
(104935159) 
9:30 a.m.
Local Energy Decay on Schwarzschild and Kerr black hole backgrounds.
Mihai Horia Tohaneanu*, University of California at Berkeley
(104935137) 
10:00 a.m.
Exponential decay of dispersion managed solitons.
M. Burak Erdogan*, University of Illinois Urbana Champaign
(104935114) 
10:30 a.m.
An operatorvalued Wiener inversion theorem leading to Schrödinger dispersive estimates.
Marius Beceanu, University of Chicago
Michael Goldberg*, Johns Hopkins University
(104943131)

9:00 a.m.

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)

3:00 p.m.

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)

3:00 p.m.

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

3:00 p.m.
Degeneration of flat structures.
Moon Duchin*, University of Michigan
Christopher Leininger, University of Illinois
Kasra Rafi, University of Oklahoma
(104951198) 
4:00 p.m.
Real REL is a flow.
Barak Weiss*, Ben Gurion University, Be'er Sheva, Israel.
(10493770)

3:00 p.m.

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)

3:00 p.m.

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

3:00 p.m.
Good Weights and Goodenough Weights on $\mathbb{R}^{+}$.
Sandy Grabiner*, Pomona College
(10494689) 
3:30 p.m.
On the maximal ideals of normed and mconvex algebras.
Hugo Arizmendi Peimbert*, Universidad Nacional Autonoma de Mexico
(104946110) 
4:00 p.m.
On some Qlike properties in Topological Algebras.
Lourdes Palacios*, Universidad Autonoma Metropolitana Iztapalapa
(104946133) 
4:30 p.m.
Extremal problems for analytic discs and analytic balls, and polynomial hulls.
Marshall A. Whittlesey*, California State University San Marcos
(104932205)

3:00 p.m.

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

3:00 p.m.
Braids, posets and orthoschemes.
Jon McCammond*, UC Santa Barbara
(104920106) 
4:00 p.m.
Area distortion in groups.
Hanna Bennett*, University of Chicago
(104920199)

3:00 p.m.

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

3:00 p.m.
Concentration of measure, laws of large numbers and mixing for Markov chains.
Malwina J Luczak*, London School of Economics
(104960130) 
4:00 p.m.
On the Limiting Shape of Random Young Tableaux for Markovian Words.
Christian Houdre*, Georgia Institute of Technology
Trevis Litherland, Georgia Institute of Technology
(104960170) 
5:00 p.m.
An Elementary Technique to Prove some Basic Inequalities in Convex Geometry.
Daniel N Dadush*, Georgia Institute of Technology
Vempala S Santosh, Georgia Institute of Technology
(10495208)

3:00 p.m.

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

3:00 p.m.
Intersection cuts from maximal latticefree convex sets and liftandproject cuts from multipleterm disjunctions.
Egon Balas*, Carnegie Mellon University
(104990139) 
4:00 p.m.
On Large Gaps in Small Hierarchical Models.
Edwin O'Shea*, Centro de Investigacion y de Estudios Avanzados del IPN
(10499039) 
4:30 p.m.
On connectivity of fibers with positive marginals in multiple logistic regression.
Hisayuki Hara, University of Tokyo
Akimichi Takemura, University of Tokyo
Ruriko Yoshida*, University of Kentucky
(10496234) 
5:00 p.m.
Commuting birthanddeath processes.
Steven N Evans, UC Berkeley
Bernd Sturmfels*, UC Berkeley
Caroline Uhler, UC Berkeley
(10496019)

3:00 p.m.

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

3:00 p.m.
The Hopf monoid of generalized permutahedra.
Marcelo Aguiar*, Texas A&M University
Federico Ardila, San Francisco State University
(10490592) 
4:00 p.m.
Triangulation of root polytopes and reduced forms.
Karola Meszaros*, MIT
(10490599) 
4:30 p.m.
Positroids and Schubert Matroids.
Suho Oh*, Massachusetts Institute of Technology
(104905126) 
5:00 p.m.
Polypositroids.
Alexander Postnikov*, MIT
Thomas Lam, Harvard University
(104905172)

3:00 p.m.

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