AMS Sectional Meeting Full Program
Current as of Sunday, May 3, 2009 00:21:11
2009 Spring Eastern Section Meeting
Worcester, MA, April 2526, 2009 (Saturday  Sunday)
Meeting #1050
Associate secretaries: Steven H Weintraub, AMS steve.weintraub@lehigh.edu
Saturday April 25, 2009

Saturday April 25, 2009, 7:30 a.m.4:00 p.m.
Registration
Foyer of Room 102, Higgins Laboratories 
Saturday April 25, 2009, 7:30 a.m.4:00 p.m.
Exhibit and Book Sale
Room 102, Higgins Laboratories 
Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Symplectic and Contact Topology, I
Room 104, Salisbury Laboratories
Organizers:
Peter Albers, Purdue University/ETH Zurich palbers@math.purdue.edu
Basak Gurel, Vanderbilt University basak.gurel@vanderbilt.edu

8:00 a.m.
Topological properties of symplectomorphism groups.
Olguta Buse*, Indiana University Purdue University Indianapolis
(10505119) 
8:30 a.m.
The Full Orbifold $K$theory of Abelian Symplectic Quotients.
R Goldin, George Mason University
M Harada, McMaster University
T Holm*, Cornell University
T Kimura, Boston University
(10505313) 
9:00 a.m.
Homoclinic orbits and pseudoholomorphic curves.
Samuel T Lisi*, Stanford University
(10505826) 
9:30 a.m.
Degenerate Maxima for Hamiltonian Loops.
Mike Chance*, Stony Brook University
(10505336) 
10:00 a.m.
Symplectic embeddings of domains in Euclidean space.
Richard K Hind*, University of Notre Dame
(10505125) 
10:30 a.m.
Hofer's geometry and Maslov class rigidity.
Ely Kerman*, University of Illinois at UrbanaChampaign
(10505316)

8:00 a.m.

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on The Mathematics of Climate Change, I
Room 114, Higgins Laboratories
Organizers:
Catherine A. Roberts, College of the Holy Cross croberts@holycross.edu
Gareth E. Roberts, College of the Holy Cross
Mary Lou Zeeman, Bowdoin College

8:00 a.m.
Introduction to the Mathematics of Climate Change.
Mary Lou Zeeman*, Bowdoin College and Cornell University
(105086107) 
9:00 a.m.
Periodic Versus Constant Proportion Fish Exploitation Policies.
AbdulAziz Yakubu*, Howard University
Jon Conrad, Cornell University
Mary Lou Zeeman, Bowdoin College
(10509299) 
9:30 a.m.
Climateinduced changes in spatial distribution of Northwest Atlantic fish stocks: implications for management.
Janet A. Nye*, NOAA National Marine Fisheries Service, Northweast Fisheries Science Center
Jason S. Link, NOAA National Marine Fisheries Service Northeast Fisheries Science Center
Jonathan A. Hare, NOAA National Marine Fisheries Service Northeast Fisheries Science Center
(10509267) 
10:00 a.m.
North Atlantic Climate Variability: Preliminary Analysis of Historical Weather Data and Stable Isotope Time Series from Cave Dripwater and a HoloceneAge Stalagmite from Bermuda.
Steven E Gaurin*, University of Massachusetts
(105000155) 
10:30 a.m.
Audience discussion on the role of mathematics in climate change research, moderated by Mary Lou Zeeman.

8:00 a.m.

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Discrete Geometry and Combinatorics, I
Room 116, Higgins Laboratories
Organizers:
Egon Schulte, Northeastern University schulte@neu.edu
Brigitte Servatius, Worcester Polytechnic Institute

8:00 a.m.
Equivalent Mechanisms and Configuration Spaces.
Servatius Herman*, Worcester Polytechnic Institute
(10500554) 
8:30 a.m.
Periodic Rigidity.
Elissa Ross*, Department of Mathematics and Statistics, York University
(10505271) 
9:00 a.m.
Symmetry as a sufficient condition for a finite flex.
Bernd Schulze*, York University
(10505252) 
9:30 a.m.
Bodyandcad geometric constraint systems.
Kirk Haller, SolidWorks Corporation
Audrey LeeSt.John*, Mount Holyoke College
Meera Sitharam, University of Florida
Ileana Streinu, Smith College
Neil White, University of Florida
(10505182) 
10:00 a.m.
If you can hide behind it, can you hide inside it?
Daniel A Klain*, University of Massachusetts Lowell
(10505284) 
10:30 a.m.
Global Rigidity.
Robert Connelly*, Cornell University
Walter J Whiteley, York University
(10505240)

8:00 a.m.

Saturday April 25, 2009, 8:00 a.m.10:50 a.m.
Special Session on Algebraic Graph Theory, Association Schemes, and Related Topics, I
Room 218, Higgins Laboratories
Organizers:
William J. Martin, Worcester Polytechnic Institute martin@wpi.edu
Sylvia A. Hobart, University of Wyoming

8:00 a.m.
The spectral radius of monotone graph properties.
V. Nikiforov*, University of Memphis, Memphis, TN
(105005105) 
8:30 a.m.
Almost distanceregular graphs.
Edwin R. van Dam*, Tilburg University
(10500557) 
9:00 a.m.
Partition Graphs.
Mike Newman*, University of Ottawa
(105005138) 
9:30 a.m.
Eigenvalues and connectivity of regular graphs.
Sebastian M. Cioabă*, University of Delaware
(10500537) 
10:00 a.m.
The Average Number of Block Interchanges Needed to Sort A Permutation.
Miklos Bona*, University of Florida
Ryan T Flynn, Penn State University
(10500563) 
10:30 a.m.
On association schemes with thin thin residue.
PaulHermann Zieschang*, University of Texas at Brownsville
(10502059)

8:00 a.m.

Saturday April 25, 2009, 8:20 a.m.10:50 a.m.
Special Session on Analysis of Weakly Differentiable Maps with Constraints and Applications, I
Room 305, Salisbury Laboratories
Organizers:
Fengbo Hang, Courant Institute, New York University
Mohammad Reza Pakzad, University of Pittsburgh pakzad@pitt.edu

8:20 a.m.
The Lattice Faddeev Model.
Hans K Shmidheiser*, Courant Institute, New York University
(10505772) 
9:00 a.m.
Rigidity and density of smooth mappings in Sobolev spaces of isometries.
Marta Lewicka, University of Minnesota
Maria Giovanna Mora, Sissa, Italy
Reza Pakzad*, University of Pittsburgh
(105046132) 
9:40 a.m.
Characterizations of Sobolev spaces and related inequalities.
HoaiMinh Nguyen*, Institute for Advanced Study, School of Mathematics
(105026120) 
10:20 a.m.
Highly regular surjections between Carnot groups.
Piotr Hajlasz*, University of Pittsburgh
Jeremy T. Tyson, University of Illinois
(105022168)

8:20 a.m.

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on Number Theory, I
Room 154, Higgins Laboratories
Organizers:
John T. Cullinan, Bard College cullinan@bard.edu
Siman Wong, University of Massachusetts, Amherst

9:00 a.m.
Linear independence of zeta zeros in function fields.
Byungchul Cha*, Muhlenberg College
(10501107) 
9:30 a.m.
Benford's Law, Values of LFunctions and the 3x+1 Problem.
Steven J Miller*, Williams College
(10501132) 
10:00 a.m.
Average values of Lfunctions via relative trace formula.
Andrew Knightly*, University of Maine
Charles Li, Chinese University of Hong Kong
(105011121) 
10:30 a.m.
Averages of $L$functions over Quadratic Function Fields.
Russell Prime*, University of Connecticut
(105011144)

9:00 a.m.

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on QuasiStatic and Dynamic Evolution in Fracture Mechanics
Room 407, Salisbury Laboratories
Organizers:
Christopher J. Larsen, Worcester Polytechnic Institute cjlarsen@wpi.edu

9:00 a.m.
Models for dynamic brittle fracture.
Chris Larsen*, WPI
(105074149) 
9:30 a.m.
Quasistatic crack growth in finite elasticity with noninterpenetration.
Gianni Dal Maso*, SISSA
(105074147) 
10:00 a.m.
Simulation of Brittle Fracture using Phase Field Approximations and AFEM.
Christoph Ortner*, University of Oxford
(105074152) 
10:30 a.m.
On crack initiation in dynamic brittle fracture.
Florin Maris*, WPI
(105074148)

9:00 a.m.

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on Scaling, Irregularities, and Partial Differential Equations, I
Room 406, Salisbury Laboratories
Organizers:
Umberto Mosco, Worcester Polytechnic Institute
Bogdan M. Vernescu, Worcester Polytechnic Institute vernescu@wpi.edu

9:00 a.m.
Discontinuities in the Wave Propagation Through Dynamic Materials.
Konstantin A Lurie*, Professor, Worcester Polytechnic Institute
(105035172) 
9:30 a.m.
Homogenization of elasticity equations without scale separation.
Leonid Berlyand*, Penn State University
Houman Owhadi, California Institute of Technology
(105035157) 
10:00 a.m.
Limit shapes and the complex Burgers equation.
Richard Kenyon*, Brown University
(105082124) 
10:30 a.m.
The Mosco convergence and the weak convergence of the Wiener measures for the weighted thin layers and boundaries.
Jun Masamune*, Department of Mathematical Sciences  Worcester Polytechnic Institute
(10506096)

9:00 a.m.

Saturday April 25, 2009, 9:00 a.m.10:50 a.m.
Special Session on Real and Complex Dynamics of Rational Difference Equations with Applications, I
Room 202, Higgins Laboratories
Organizers:
M. R. S. Kulenovic, University of Rhode Island mkulenovic@mail.uri.edu
Orlando Merino, University of Rhode Island

9:00 a.m.
Open Problems and Conjectures in Rational Difference Equations and Systems.
Ladas Gerry*, University of Rhode Island
(105039106) 
9:30 a.m.
Periodicites which Preserve and Periodicies which Destroy Boundedness.
S W Schultz*, Providence College
E A Grove, University of Rhode Island
G Ladas, University of Rhode Island
E Camouzis, American College of Greece
(10503987) 
10:00 a.m.
A Solution to the Y2K Problem.
Orlando Merino*, University of Rhode Island
(10503948) 
10:30 a.m.
Global Behavior of a Nonlinear Equation.
Mihaela Predescu*, Bentley University
(105039117)

9:00 a.m.

Saturday April 25, 2009, 9:30 a.m.10:50 a.m.
Special Session on Effective Dynamics and Interactions of Localized Structures in Schrödinger Type Equations, I
Room 105, Salisbury Laboratories
Organizers:
Fridolin Ting, Lakehead University fting@lakeheadu.ca

9:30 a.m.
On the ThomasFermi ground state in a parabolic trap.
Dmitry Pelinovsky*, Department of Mathematics, McMaster University
(10504142) 
10:00 a.m.
Dark Solitons in BoseEinstein Condensates: Experimental Findings, Numerical Computations and Theoretical Directions.
Panayotis Kevrekidis*, UMass, Amherst
(10503539) 
10:30 a.m.
Sharp scattering and blow up regimes for focusing nonlinear KleinGordon equation.
Slim Ibrahim*, University of Victoria
Nader Masmoudi, The Courant Institute, NYU
Kenji Nakanishi, Kyoto University
(105035169)

9:30 a.m.

Saturday April 25, 2009, 11:00 a.m.11:50 a.m.
Invited Address
Fractal spectra between Scylla and Charybdis.
Room 115, Salisbury Laboratories
Umberto Mosco*, Worcester Polytechnic Institute
(10503502) 
Saturday April 25, 2009, 2:00 p.m.2:50 p.m.
Invited Address
Topology of weakly differentiable maps.
Room 115, Salisbury Laboratories
Fengbo Hang*, Courant Institute of New York University
(10505803) 
Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Effective Dynamics and Interactions of Localized Structures in Schrödinger Type Equations, II
Room 105, Salisbury Laboratories
Organizers:
Fridolin Ting, Lakehead University fting@lakeheadu.ca

3:00 p.m.
Realistic Models of NLS Large time behavior and Applications to Physics.
Avy Soffer*, Department of Mathematics, Rutgers University
(105035167) 
3:30 p.m.
Dynamics of vortices in a damped GrossPitaevskii equation.
Matthias Kurzke, University of Bonn
Christof Melcher, Oxford University
Roger Moser, University of Bath
Daniel Spirn*, University of Minnesota
(105035127) 
4:00 p.m.
Solitary Waves in the Earth's Interior and their Stability.
Gideon Simpson*, University of Toronto
Michael I Weinstein, Columbia University
(105035112) 
4:30 p.m.
Regularization of collapse in dynamics of biological cells.
Pavel M Lushnikov*, Department of Mathematics and Statistics, University of New Mexico
Mark Alber, Department of Mathematics, University of Notre Dame
Nan Chen, University of Notre Dame
(105092154) 
5:00 p.m.
Meanfield limit of quantum systems of many bosons.
Israel Michael Sigal*, University of Toronto / Institute for Advanced Study
(105081153) 
5:30 p.m.
Dynamics of solitons of the nonlinear Schroedinger / Gross Pitaevskii equation.
Michael I Weinstein*, Columbia University
(105035151)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.6:30 p.m.
Special Session on Analysis of Weakly Differentiable Maps with Constraints and Applications, II
Room 305, Salisbury Laboratories
Organizers:
Fengbo Hang, Courant Institute, New York University
Mohammad Reza Pakzad, University of Pittsburgh pakzad@pitt.edu

3:00 p.m.
On buckling instability in hyperelasticity.
Yury Grabovsky*, Temple University
Lev Truskinovsky, Ecole Polytechnique
(105074166) 
3:50 p.m.
A scaling law for $3$d nonlinear elastic energies of thin plates with strain at free equilibria.
Marta Lewicka*, University of Minnesota
Reza Pakzad, University of Pittsburgh
(105046113) 
4:30 p.m.
Some Remarks on Total Variation Flow.
Robert Hardt*, Rice University
Rolf Ryham, Rice University
(10503583) 
5:20 p.m.
Uniqueness for ordinary differential equations associated with quasiconformal mappings.
Tadeusz Iwaniec, Syracuse University
Leonid V. Kovalev*, Syracuse University
Jani Onninen, Syracuse University
(10503492) 
6:00 p.m.
Gamma quasiregular mappings and nonlinear planar eliptic systems.
Daniel Faraco*, Universidad Autonoma de Madrid
(105035175)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.6:20 p.m.
Special Session on Symplectic and Contact Topology, II
Room 104, Salisbury Laboratories
Organizers:
Peter Albers, Purdue University/ETH Zurich palbers@math.purdue.edu
Basak Gurel, Vanderbilt University basak.gurel@vanderbilt.edu

3:00 p.m.
Complexifications of Morse functions and exact Lagrangian submanifolds in cotangent bundles.
Joseph A Johns*, NYU
(10505331) 
3:30 p.m.
Connexity of some symplectomorphism groups.
Martin Pinsonnault*, The University of Western Ontario
(10505346) 
4:00 p.m.
Coisotropic Submanifolds, Leafwise Fixed Points, and Presymplectic Embeddings.
Fabian J. Ziltener*, University of Toronto
(10505330) 
4:30 p.m.
A Symplectic BrunnMinkowski Inequality.
Yaron Ostrover*, MIT
(10505143) 
5:00 p.m.
Lagrangian spherebundles.
Tim Perutz*, Columbia University
(10505721) 
5:30 p.m.
Open string topology and classical knots.
Dennis Sullivan, Stony Brook University
Michael Sullivan*, University of Massachusetts Amherst
(10505715) 
6:00 p.m.
GKM Fiber Bundles.
Catalin Zara*, University of Massaschusetts Boston
(10505524)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Topological Robotics
Room 407, Salisbury Laboratories
Organizers:
Li Han, Clark University
Lee N. Rudolph, Clark University lrudolph@black.clarku.edu

3:00 p.m.
A look at polyhedral products.
Alexander I. Suciu*, Northeastern University
(105057171) 
3:30 p.m.
Motion planning in tori and topological complexity of basisconjugating automorphism groups.
Daniel C. Cohen, Louisiana State University
Goderdzi Pruidze*, University of Louisiana
(105055176) 
4:00 p.m.
Knot tying with singlepiece fixtures.
Matthew P. Bell*, Dartmouth College
Devin J. Balkcom, Dartmouth College
(105074165) 
4:30 p.m.
Extremal configurations of revolutejointed robot arms.
Ciprian S. Borcea*, Rider University
Ileana Streinu, Smith College
(10505377) 
5:00 p.m.
SimplexTree Based Kinematics of Foldable Objects as Multibody Systems Involving Loops.
Li Han*, Clark University
Lee Rudolph, Clark University
(105057159) 
5:30 p.m.
Planning Regular Homotopies of Planar Loops with Revolute Joints.
Lee Rudolph*, Clark University
Li Han, Clark University
(105057160)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:45 p.m.
Special Session on The Mathematics of Climate Change, II
Room 114, Higgins Laboratories
Organizers:
Catherine A. Roberts, College of the Holy Cross croberts@holycross.edu
Gareth E. Roberts, College of the Holy Cross
Mary Lou Zeeman, Bowdoin College

3:00 p.m.
Weather prediction and Chaos.
James A Yorke*, Univ of Maryland, Math & Physics Depts and IPST
(10503750) 
3:30 p.m.
Poleward Expansion of Hadley Cells.
William F. Langford*, University of Guelph, Guelph ON Canada
Greg Lewis, University of Ontario Institute of Technology, Oshawa ON Canada L1H7K4
(10508660) 
4:00 p.m.
Understanding the relative humidity distribution of the atmosphere using a simple model.
Paul A O'Gorman*, Department of Earth, Atmospheric, and Planetary Sciences
(10500065) 
4:30 p.m.
A componentbased framework for semiempirical, processbased modeling of carbon flux from terrestrial ecosystems.
Sudeep Samanta*, Woods Hole Research Center
Richard A. Houghton, Woods Hole Research Center
(105000145) 
5:00 p.m.
Audience discussion on the role of mathematics in climate change research, moderated by Gareth Roberts.

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Number Theory, II
Room 154, Higgins Laboratories
Organizers:
John T. Cullinan, Bard College cullinan@bard.edu
Siman Wong, University of Massachusetts, Amherst

3:00 p.m.
Weyl Group Multiple Dirichlet Series and GTPatterns: Part I.
Jennifer Beineke*, Western New England College
Ben Brubaker, MIT
Sharon Frechette, College of the Holy Cross
(105011163) 
3:30 p.m.
Weyl group multiple Dirichlet series, and GT patterns: Part II.
Jennifer Beineke, Western New England College
Ben Brubaker, Massachusetts Institute of Technology
Sharon Frechette*, College of the Holy Cross
(105011150) 
4:00 p.m.
Blaschke Product Mappings: Visualization and Automorphic Properties.
Cristina Ballantine*, College of the Holy Cross
Dorin Ghisa, York University
(105030126) 
4:30 p.m.
Computations with Overconvergent Modular Symbols.
David Pollack*, Wesleyan University
Robert Pollack, Boston University
(105011141) 
5:00 p.m.
BernoulliHurwitz numbers, Wieferich primes and Galois representations.
Álvaro LozanoRobledo*, University of Connecticut  Storrs
(10501185) 
5:30 p.m.
Galois invariance of local root numbers.
David E. Rohrlich*, Boston University
(10501135)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Discrete Geometry and Combinatorics, II
Room 116, Higgins Laboratories
Organizers:
Egon Schulte, Northeastern University schulte@neu.edu
Brigitte Servatius, Worcester Polytechnic Institute

3:00 p.m.
Growth of Homogeneous Planar Tessellations.
Stephen S. Graves, Syracuse University
Mark E. Watkins*, Syracuse University
(10500576) 
3:30 p.m.
On the Number of Spanning Trees a Planar Graph Can Have.
Andre Schulz*, Smith College
Kevin Buchin, TU Eindhoven
(10500570) 
4:00 p.m.
Flattening singlevertex origami: the nonexpansive case.
Gaiane Panina, Institute for Informatics and Automation, StPetersburg, Russia
Ileana Streinu*, Smith College
(10505278) 
4:30 p.m.
What makes Materials Flexible or Rigid?
Michael F Thorpe*, Arizona State University
(10505156) 
5:00 p.m.
A catalog of selfdual plane graphs with maximum degree 4.
Jack E Graver*, Syracuse University
Elizabeth J Hartung, Syracuse University
(10500551) 
5:30 p.m.
Remarkable Delaunay Polytopes derived from the Leech lattice.
Konstantin Rybnikov*, University of Massachusetts at Lowell
(105052174)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:20 p.m.
Special Session on Scaling, Irregularities, and Partial Differential Equations, II
Room 406, Salisbury Laboratories
Organizers:
Umberto Mosco, Worcester Polytechnic Institute
Bogdan M. Vernescu, Worcester Polytechnic Institute vernescu@wpi.edu

3:00 p.m.
Remarks on nonlinear elliptic equations.
Louis Nirenberg*, Courant Institute
(105035179) 
3:30 p.m.
Gradient Estimates for the Perfect Conductivity Problem.
Yanyan Li*, Rutgers University, New Brunswick, New Jersey
Ellen ShiTing Bao, University of Minnesota
Biao Yin, Rutgers University
(105035100) 
4:00 p.m.
Pressure Beneath a Stokes Wave.
Walter A Strauss*, Brown University
(105035125) 
4:30 p.m.
Partial Differential Equations Arising from Electrostatic MEMS.
Yujin Guo*, School of Mathematics, University of Minnesota
(10503573) 
5:00 p.m.
Uniqueness of locally invariant Laplacian, Dirichlet form and Brownian motion on Sierpinski carpets.
Alexander Teplyaev*, University of Connecticut
(105060115)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:50 p.m.
Special Session on Algebraic Graph Theory, Association Schemes, and Related Topics, II
Room 218, Higgins Laboratories
Organizers:
William J. Martin, Worcester Polytechnic Institute martin@wpi.edu
Sylvia A. Hobart, University of Wyoming

3:00 p.m.
On pseudocyclic association schemes.
M. E. Muzychuk*, Netanya Academic College, Netanya, Israel
I. N. Ponomarenko, Institute of Mathematics, St. Petersburg, Russia
(10500569) 
3:30 p.m.
Distanceregular graphs with tails.
Aleksandar Jurisic*, Faculty of Computer and Information Science, University of Ljubljana and IMFM
Paul Terwilliger, Department of Mathematics, University of WisconsinMadison
(105005102) 
4:00 p.m.
Nonexistence of Certain Amorphous Association Schemes.
Jianmin Ma*, Oxford College of Emory University
(10500597) 
4:30 p.m.
Towards a classification of the tridiagonal pairs.
Paul Terwilliger*, University of Wisconsin
(105005162) 
5:00 p.m.
An Inequality for Leonard Systems.
John Caughman*, Portland State University
(105005170) 
5:30 p.m.
Leonard pairs associated with $sl_2$.
Hasan Alnajjar, University of Jordan
Brian W Curtin*, University of South Florida
(10500588)

3:00 p.m.

Saturday April 25, 2009, 3:00 p.m.5:20 p.m.
Special Session on Real and Complex Dynamics of Rational Difference Equations with Applications, II
Room 202, Higgins Laboratories
Organizers:
M. R. S. Kulenovic, University of Rhode Island mkulenovic@mail.uri.edu
Orlando Merino, University of Rhode Island

3:00 p.m.
Global Bifurcation for Competitive Systems in the Plane.
M R.S. Kulenovic*, Department of Mathematics, University of Rhode Island
Orlando Merino, Department of Mathematics, University of Rhode Island
(10503944) 
3:30 p.m.
Dynamics of certain classes of periodic rational difference equations.
Vlajko L Kocic*, Xavier University of Louisiana
(10503998) 
4:00 p.m.
On the Character of the System $$ x_{n+1}=\frac{\alpha_{1}}{x_{n} + y_{n}} \quad , \quad y_{n+1}=\frac{\alpha_{2} + y_{n}}{B_{2} x_{n} + y_{n}} $$.
Y. Kostrov*, University of Rhode Island
E Grove, University of Rhode Island
S Schultz, Providence College
M Radin, RIT
(105039136) 
4:30 p.m.
Two Species Competitive Model with Allee's Effect.
Ann Brett*, University of Rhode Island
Mustafa Kulenovic, University of Rhode Island
(10503964) 
5:00 p.m.
Unboundedness for some classes of rational difference equations.
Gabriel Lugo, University of Rhode Island
Frank J Palladino*, Stony Brook University
(10503989)

3:00 p.m.
Sunday April 26, 2009

Sunday April 26, 2009, 8:00 a.m.12:00 p.m.
Registration
Foyer of Room 102, Higgins Laboratories 
Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Symplectic and Contact Topology, III
Room 104, Salisbury Laboratories
Organizers:
Peter Albers, Purdue University/ETH Zurich palbers@math.purdue.edu
Basak Gurel, Vanderbilt University basak.gurel@vanderbilt.edu

8:00 a.m.
Targetlocal Gromovcompactness for Jcurves.
Joel W Fish*, Stanford University
(105053109) 
8:30 a.m.
A nonextension result on the spectral metric.
Zhigang Han*, University of Massachusetts at Amherst
(10505310) 
9:00 a.m.
On the Floer homology of symplectic orbifolds.
Weimin Chen*, University of Massachusetts Amherst
(10505727) 
9:30 a.m.
Period Floer homology and SeiebergWitten cohomology.
YiJen Lee*, Purdue
C Taubes, Harvard University
(10505794) 
10:00 a.m.
Asymptotics and intersection theory of punctured pseudoholomorphic curves.
Richard Siefring*, Department of Mathematics, Michigan State University
(105053135) 
10:30 a.m.
Symplectic Floer homology of areapreserving surface diffeomorphisms and sharp fixed point bounds.
Andrew CottonClay*, UC Berkeley/MIT
(10505323)

8:00 a.m.

Sunday April 26, 2009, 8:00 a.m.10:45 a.m.
Special Session on The Mathematics of Climate Change, III
Room 114, Higgins Laboratories
Organizers:
Catherine A. Roberts, College of the Holy Cross croberts@holycross.edu
Gareth E. Roberts, College of the Holy Cross
Mary Lou Zeeman, Bowdoin College

8:00 a.m.
Challenges to physicalbiological coupling in climate models.
Amala Mahadevan*, Boston University
(105076158) 
8:30 a.m.
Multidecadal Variability of Atlantic Meridional Overturning Circulation in the Community Climate System Model Version 3.
YoungOh Kwon*, Woods Hole Oceanographic Institution
Claude Frankignoul, LOCEAN, Université Pierre et Marie Curie, Paris, France
(105000114) 
9:00 a.m.
How Ice Line Moves: Revisiting Budyko's Energy Balance Model.
Esther R. Widiasih*, University of Minnesota, Twin Cities
(10503749) 
9:30 a.m.
Nonlinear threshold behavior during the loss of Arctic sea ice.
J. S. Wettlaufer*, Yale University
(10508691) 
10:00 a.m.
Audience discussion on the role of mathematics in climate change research, moderated by Catherine A. Roberts.

8:00 a.m.

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Discrete Geometry and Combinatorics, III
Room 116, Higgins Laboratories
Organizers:
Egon Schulte, Northeastern University schulte@neu.edu
Brigitte Servatius, Worcester Polytechnic Institute

8:00 a.m.
Polygonal Complexes and Symmetry.
Egon Schulte*, Northeastern University
Daniel Pellicer, University of New Brunswick
(10505181) 
8:30 a.m.
Highly Incident Configurations.
Leah Wrenn Berman*, Ursinus College
(10505266) 
9:00 a.m.
Cobinatorial structure of chiral polyhedra in the Euclidean space.
Daniel Pellicer*, University of New Brunswick
Asia I. Weiss, York University
(10505247) 
9:30 a.m.
Quotient representations for uniform tilings.
Gordon Iam Williams*, Ursinus College
(10505286) 
10:00 a.m.
On Representable Matroids With Large Planes.
Sandra Kingan*, Brooklyn College, CUNY
(10500555) 
10:30 a.m.
More on the $11$cell.
Barry Monson*, University of New Brunswick
Egon Schulte, Northeastern University
Daniel Hay, University of New Brunswick
(10505145)

8:00 a.m.

Sunday April 26, 2009, 8:00 a.m.10:50 a.m.
Special Session on Algebraic Graph Theory, Association Schemes, and Related Topics, III
Room 218, Higgins Laboratories
Organizers:
William J. Martin, Worcester Polytechnic Institute martin@wpi.edu
Sylvia A. Hobart, University of Wyoming

8:00 a.m.
Cocliques and Polytopes.
Chris D Godsil*, Combinatorics & Optimization, University of Waterloo
(105005110) 
8:30 a.m.
Directed quotient graphs of bipartite graphs.
Leif K Jorgensen*, Aalborg University
(105005108) 
9:00 a.m.
Small Four Weight Spin Models.
Ada Chan*, York University
(105005142) 
9:30 a.m.
Hemisystems of unitary spaces.
Tim Penttila*, Colorado State University
(10500568) 
10:00 a.m.
The Combinatorics of Transitive Extensions.
Mikhail H Klin, Ben Gurion University of the Negev
Dale M Mesner, University of Nebraska
Andrew J Woldar*, Villanova University
(10500558) 
10:30 a.m.
A binary linear code and its combinatorial properties.
Junhua Wu*, Worcester Polytechnic Institute
(105005161)

8:00 a.m.

Sunday April 26, 2009, 8:00 a.m.12:00 p.m.
Exhibit and Book Sale
Room 102, Higgins Laboratories 
Sunday April 26, 2009, 8:20 a.m.10:50 a.m.
Special Session on Analysis of Weakly Differentiable Maps with Constraints and Applications, III
Room 305, Salisbury Laboratories
Organizers:
Fengbo Hang, Courant Institute, New York University
Mohammad Reza Pakzad, University of Pittsburgh pakzad@pitt.edu

8:20 a.m.
Harmonic mappings between doubly connected domains.
Tadeusz Iwaniec, Syracuse University
Leonid V Kovalev, Syracuse University
Jani Onninen*, Syracuse University
(105030128) 
9:00 a.m.
Compactness and Minimization for TwoDimensional Skyrme Energy.
Yisong Yang*, Department of Mathematics, Yeshiva University
(10505861) 
9:40 a.m.
Boundary Regularity of Biharmonic Maps.
Tobias Lamm, University of British Columbia
Changyou Wang Wang*, University of Kentucky
(105058123) 
10:20 a.m.
Hamiltonian identities for PDEs and their applications.
Changfeng Gui*, University of Connecticut
(10503590)

8:20 a.m.

Sunday April 26, 2009, 8:30 a.m.10:50 a.m.
Special Session on Effective Dynamics and Interactions of Localized Structures in Schrödinger Type Equations, III
Room 105, Salisbury Laboratories
Organizers:
Fridolin Ting, Lakehead University fting@lakeheadu.ca

8:30 a.m.
Existence and Nonexistence of Electricity in TwoDimensional Static Gauge Field Theories.
Yisong Yang*, Department of Mathematics, Yeshiva University
(10508162) 
9:00 a.m.
Charged vortices of finite energy in the ChernSimonsHiggs theorey.
Robin Ming Chen*, School of Mathematics, University of Minnesota
Yujin Guo, School of Mathematics, University of Minnesota
Daniel Spirn, School of Mathematics, University of Minnesota
Yisong Yang, Department of Mathematics, Yeshiva University
(105035122) 
9:30 a.m.
Tunneling of solitons through potential barriers.
Walid Abou Salem*, University of Toronto
(105035118) 
10:00 a.m.
The cubic fourthorder Schrodinger equation.
Benoit Pausader*, Brown University
(105035111) 
10:30 a.m.
Effective Dynamics of multivortices in an external potential for GinzburgLandau Gradient flow.
Fridolin Ting*, Lakehead University
(10503538)

8:30 a.m.

Sunday April 26, 2009, 8:30 a.m.10:50 a.m.
Special Session on Number Theory, III
Room 154, Higgins Laboratories
Organizers:
John T. Cullinan, Bard College cullinan@bard.edu
Siman Wong, University of Massachusetts, Amherst

8:30 a.m.
Simultaneous diagonal equations of odd degrees.
Michael P. Knapp*, Loyola College
(10501129) 
9:00 a.m.
Codes over $\mathbb{F}_{p^2}$ and $\mathbb{F}_p \times \mathbb{F}_p$, lattices, and theta functions.
Caleb McKinley Shor*, Western New England College
(105011143) 
9:30 a.m.
Prime Divisors in Arithmetic Dynamics.
Rafe Jones*, College of the Holy Cross
(105011129) 
10:00 a.m.
Specializations of finitely ramified towers of selfmaps of the projective line.
Farshid Hajir*, University of Massachusetts, Amherst
John Cullinan, Bard College
(105011140) 
10:30 a.m.
Variants of a problem of Erdos and Romanov.
Florian Luca*, UNAM
(10501134)

8:30 a.m.

Sunday April 26, 2009, 9:00 a.m.10:50 a.m.
Special Session on Scaling, Irregularities, and Partial Differential Equations, III
Room 406, Salisbury Laboratories
Organizers:
Umberto Mosco, Worcester Polytechnic Institute
Bogdan M. Vernescu, Worcester Polytechnic Institute vernescu@wpi.edu

9:00 a.m.
On the Mixed Problem for Second Order Elliptic Systems.
Irina Mitrea*, University of Virginia
(105035177) 
9:30 a.m.
A Novel Finite Element Meshing Technique Driven by Fractal Koch Curves.
Emily J. Evans*, Worcester Polytechnic Institute
(105035180) 
10:00 a.m.
Moving Interfaces in Sectral Problems: Laplace Eigenvalues on Polygons and Deformed Manifolds.
Pavel Grinfeld*, Drexel Univerosity
Gilbert Strang, MIT
(105049156) 
10:30 a.m.
Approximating a SPDE with a coefficient with infinity number of scales.
Marcus Sarkis*, WPI Department of Mathematical Sciences and IMPA
Juan Galvis, Texas A & M Department of Mathematics
(105065146)

9:00 a.m.

Sunday April 26, 2009, 9:00 a.m.10:40 a.m.
Session for Contributed Papers
Room 407, Salisbury Laboratories

9:00 a.m.
Parabolic problems with nonlocal conditions.
Abdelkader Y Boucherif*, King Fahd University of Petroleum and Minerals
(10503514) 
9:15 a.m.
On Superquadracity.
Shoshana  Abramovich*, Department of Mathematics, University of Haifa, Haifa, Israel
(10502618) 
9:30 a.m.
The Historical and Educational Origins of Probability Theory.
Willem J Wallinga*, University of New Hampshire
(10500122) 
9:45 a.m.
Expfunction method for solving nonlinear dispersive equations.
A Bathi Kasturiarachi*, Kent State University, Stark Campus
(105035130) 
10:00 a.m.
Nonorientable Contact Structures on 3manifolds.
David H Crombecque*, Muhlenberg College
(105057133) 
10:15 a.m.
NonExistence Results for Coagulation Kinetics.
Jacob C Mower*, Stevens Institute of Technology
(10508209) 
10:30 a.m.
Probability of solvability of random systems of $2$linear equations over $GF(2)$.
JiA Yeum*, The Ohio State University
(10500520)

9:00 a.m.

Sunday April 26, 2009, 11:00 a.m.11:50 a.m.
Invited Address
Lagrangian submanifolds: From physics to number theory.
Room 115, Salisbury Laboratories
Octav Cornea*, Université de Montréal
(10505305) 
Sunday April 26, 2009, 2:00 p.m.2:50 p.m.
Invited Address
A rapid survey of coarse geometry.
Room 115, Salisbury Laboratories
Kevin Whyte*, University of Illinois at Chicago
(10502004) 
Sunday April 26, 2009, 3:00 p.m.5:50 p.m.
Special Session on Symplectic and Contact Topology, IV
Room 104, Salisbury Laboratories
Organizers:
Peter Albers, Purdue University/ETH Zurich palbers@math.purdue.edu
Basak Gurel, Vanderbilt University basak.gurel@vanderbilt.edu

3:00 p.m.
Transverse knots and their branched covers.
Olga Plamenevskaya*, Stony Brook University
(105057131) 
3:30 p.m.
Areadependence in gauged GromovWitten theory.
Eduardo Gonzalez*, University of Massachusetts Boston
Chris Woodward, Rutgers University
(10505812) 
4:00 p.m.
"Fake" symplectic manifolds via Lefschetz fibrations.
Maksim Maydanskiy*, MIT
(10505311) 
4:30 p.m.
Quilted disks in Lagrangian Floer theory.
Sikimeti Ma'u*, MIT
Katrin Wehrheim, MIT
Chris Woodward, Rutgers University
(10505328) 
5:00 p.m.
Lagrangian correspondences and holomorphic quilts.
Katrin Wehrheim*, MIT
(10505317) 
5:30 p.m.
Spectral measures on toric manifolds.
Rosa SenaDias*, IST/MIT
(105053164)

3:00 p.m.

Sunday April 26, 2009, 3:00 p.m.5:50 p.m.
Special Session on Discrete Geometry and Combinatorics, IV
Room 116, Higgins Laboratories
Organizers:
Egon Schulte, Northeastern University schulte@neu.edu
Brigitte Servatius, Worcester Polytechnic Institute

3:00 p.m.
Another Look at Matching Rules.
Marjorie Senechal*, Smith College
(10505275) 
3:30 p.m.
Torohedral groups.
Norman W. Johnson*, Wheaton College, Norton, MA
(10505274) 
4:00 p.m.
Tiling lattices with translates of sublattices.
David Feldman, University of Massachusetts Lowell
James Propp*, University of Massachusetts Lowell
Sinai Robins, Nanyang Technological University
(10500579) 
4:30 p.m.
Polarity and rigidity in the plane.
Brigitte Servatius*, WPI
(10500553) 
5:00 p.m.
Some new Čebyšev sets in hyperspaces.
Robert J. MacG. Dawson*, Saint Mary's University
(10505195) 
5:30 p.m.
Theory and examples of ghost symmetry.
David Richter*, Western Michigan University
(10505208)

3:00 p.m.

Sunday April 26, 2009, 3:00 p.m.3:50 p.m.
Special Session on Scaling, Irregularities, and Partial Differential Equations, IV
Room 406, Salisbury Laboratories
Organizers:
Umberto Mosco, Worcester Polytechnic Institute
Bogdan M. Vernescu, Worcester Polytechnic Institute vernescu@wpi.edu

3:00 p.m.
Acoustic Propagation in a Random Saturated Medium: The Monophasic Case.
Robert Pertsch Gilbert*, Department of Mathematical Sciences, University of Delaware, Newark,DE
Ana Vasilic, Department of Mathematical Sciences, University of Delaware, Newark,DE
(105035104) 
3:30 p.m.
Accommodating Irregular Subdomains in Domain Decomposition Theory.
Olof B. Widlund*, Courant Institute
(105065178)

3:00 p.m.

Sunday April 26, 2009, 3:00 p.m.5:50 p.m.
Special Session on Algebraic Graph Theory, Association Schemes, and Related Topics, IV
Room 218, Higgins Laboratories
Organizers:
William J. Martin, Worcester Polytechnic Institute martin@wpi.edu
Sylvia A. Hobart, University of Wyoming

3:00 p.m.
The BannaiIto Conjecture.
S. Bang*, Department of Mathematics/Pusan National University
J H Koolen, Department of Mathematics/POSTECH
V. Moulton, School of Computing Sciences/ University of East Anglia
(105005139) 
3:30 p.m.
$Q$polynomial association schemes which are not generated by a distanceregular graph.
Jason Williford*, University of Colorado Denver
(105005103) 
4:00 p.m.
Dualtight cometric association schemes.
Sho Suda, Graduate School of Information Sciences, Tohoku University
Hajime Tanaka*, Graduate School of Information Sciences, Tohoku University
Rie Tanaka, Graduate School of Information Sciences, Tohoku University
(105005116) 
4:30 p.m.
Euclidean designs and coherent configurations.
Etsuko Bannai*, Retiered. Fukuoka, Japan
(10500580) 
5:00 p.m.
DistanceRegular Graphs Having Certain Completely Regular Subgraphs.
Hiroshi Suzuki*, Department of Mathematics and Computer Science, International Christian University
(10500593) 
5:30 p.m.
Terwilliger algebras of wreath products of oneclass association schemes.
Gargi Bhattacharyya, University of Baltimore
Sung Y Song*, Iowa State University
Rie Tanaka, Tohoku University
(105005101)

3:00 p.m.