
AMS Sectional Meeting Program by Day
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Spring Central Sectional Meeting
Iowa State University, Ames, IA
April 2628, 2013 (Friday  Sunday)
Meeting #1090
Associate secretaries:
Georgia M. Benkart, AMS benkart@math.wisc.edu
Sunday April 28, 2013

Sunday April 28, 2013, 7:30 a.m.12:00 p.m.
Book Sale and Exhibit
Room 305, Carver

Sunday April 28, 2013, 7:30 a.m.12:00 p.m.
Meeting Registration
Room 305, Carver

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Algebraic and Geometric Combinatorics, III
Room 74, Carver Organizers: Sung Y. Song, Iowa State University sysong@iastate.edu Paul Terwilliger, University of WisconsinMadison

8:00 a.m.
Table Bases as Unions of Proper Closed Subsets.
Harvey I Blau*, Department of Mathematical Sciences, Northern Illinois University
Gang Chen, School of Mathematics and Statistics, Central China Normal University
(109020147)

8:30 a.m.
The Tail Condition for Leonard Pairs.
Edward D. Hanson*, University of WisconsinMadison
(109005407)

9:00 a.m.
Nonexistence of certain abstract hyperovals of order 12.
Benjamin C Cooper*, Department of Mathematics, Colorado State University
(109005308)

9:30 a.m.
Noncommutative association schemes of rank $6$.
PaulHermann Zieschang*, Department of Mathematics, University of Texas at Brownsville
(10902065)

10:00 a.m.
$Q$polynomial distanceregular graphs and the double affine Hecke algebra of rank one.
JaeHo Lee*, University of WisconsinMadison
(10903393)

10:30 a.m.
Spreads and Packings in PG$(3,q)$.
Anton Betten*, Colorado State University
(109005114)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Analysis, Dynamics and Geometry In and Around Teichmuller Spaces, III
Room 118, Carver Organizers: Alistair Fletcher, Northern Illinois University Vladimir Markovic, California Institute of Technology Dragomir Saric, Queens College CUNY dragomir.saric@qc.cuny.edu

8:30 a.m.
Discussion

9:00 a.m.
Recent developments on the ergodicity of translation flows on flat surfaces.
Rodrigo Trevino*, Cornell University
(10903748)

9:30 a.m.
Projective structures on closed surfaces and the geometry of diffeomorphisms.
Ferry Henrik Kwakkel*, University of Sao Paulo, Sao Paulo, Brazil
(109051343)

10:00 a.m.
Induced earthquake measure map on asymptotic Teichmüller space.
Jinhua Fan*, Department of Applied Mathematics, Nanjing University of Science and Technology
Jun Hu, Department of Mathematics, Brooklyn College of CUNY
(109030232)

10:30 a.m.
On Teichmüller metric and the length spectra of topologically infinite Riemann surfaces.
Erina Kinjo*, Tokyo Institute of Technology, Department of Mathematical and Computing Sciences
(109030194)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Commutative Algebra and its Environs, III
Room 8, Carver Organizers: Olgur Celikbas, University of Missouri, Columbia Greg Piepmeyer, University of Missouri, Columbia ggpz95@mail.missouri.edu

8:00 a.m.
Resurgences: the road ahead and a look back.
Brian Harbourne*, University of NebraskaLincoln
(109014245)

9:00 a.m.
Codualizing Modules And Complexes.
Sean SatherWagstaff, North Dakota State University
Richard Wicklein*, North Dakota State University
(109013323)

9:30 a.m.
Periodic modules over Gorenstein local rings.
Amanda Croll*, University of NebraskaLincoln
(109013301)

10:00 a.m.
Cohen factorizations and applications.
Saeed Nasseh*, North Dakota State University
Sean SatherWagstaff, North Dakota State University
(109013340)

10:30 a.m.
$F$pure thresholds of quasihomogeneous polynomials.
Daniel Heranadez, University of Minnesota
Luis NunezBetancourt, University of Michigan
Emily Witt, University of Minnesota
Wenliang Zhang*, University of Nebraska
(109013374)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Commutative Ring Theory, III
Room 18, Carver Organizers: Michael Axtell, University of St. Thomas Joe Stickles, Millikin University jstickles@millikin.edu

8:00 a.m.
Length MultisetComplete Krull Monoids.
Paul Baginski*, Smith College
George J Schaeffer, University of California, Los Angeles
(109013395)

8:30 a.m.
Multiplicative Subsets of Atoms.
Ashley Rand*, University of Tennessee, Knoxville
(109013316)

9:00 a.m.
Prüfer domains and the projective line.
Bruce Olberding*, New Mexico State University
(109013196)

9:30 a.m.
Localizing Global Properties to Individual Maximal Ideals.
Thomas G Lucas*, Department of Mathematics & Statistics, University of North Carolina Charlotte
(109013324)

10:00 a.m.
Some nearNoetherian conditions.
Jim Coykendall*, North Dakota State University
Tridib Dutta, University of Pittsburgh
(109013272)

10:30 a.m.
Ascent properties for derived functors.
Sean SatherWagstaff*, North Dakota State University
(10901395)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Computability and Complexity in Discrete and Continuous Worlds, III
Room 290, Carver Organizers: Jack Lutz, Iowa State University Tim McNicholl, Iowa State University mcnichol@iastate.edu

8:00 a.m.
Combining basis theorems.
Stephen G. Simpson*, Pennsylvania State University
(10900356)

8:30 a.m.
On the Complexity of Bribery and Manipulation in Tournaments with Uncertain Information.
Nicholas Mattei, NICTA and University of New South Wales
Judy Goldsmith*, Dept of Computer Science, University of Kentucky
Andrew Klapper, Dept of Computer Science, University of Kentucky
Martin Mundhenk, Institute of Computer Science FriedrichSchillerUniversität Jena
(109068385)

9:00 a.m.
PolynomialTime Randomness and Differentiability.
John M. Hitchcock*, University of Wyoming
Joshua C. Sanderlin, University of Wyoming
(109068414)

9:30 a.m.
On the Computable Curves.
Xizhong Zheng*, Arcadia University
(109003149)

10:00 a.m.
Complexity and Symmetry.
LekHeng Lim*, University of Chicago
Ke Ye, University of Chicago
(109015267)

10:30 a.m.
Strong separations and Kolmogorov complexity.
W.M. Phillip Hudelson*, Pennsylvania State University
(10900391)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Computational Advances on Special Functions and Tropical Geometry, III
Room 2, Carver Organizers: Lubjana Beshaj, Oakland University Emma Previato, Boston University ep@bu.edu

Sunday April 28, 2013, 8:00 a.m.9:50 a.m.
Special Session on Control Theory and Qualitative Analysis of Partial Differential Equations, III
Room 132, Carver Organizers: George Avalos, University of NebraskaLincoln gavalos@math.unl.edu Scott Hansen, Iowa State University

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Discrete Methods and Models in Mathematical Biology, III
Room 298, Carver Organizers: Dora Matache, University of NebraskaOmaha Stephen J. Willson, Iowa State University swillson@iastate.edu

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Extremal Combinatorics, III
Room 268, Carver Organizers: Steve Butler, Iowa State University Ryan Martin, Iowa State University rymartin@iastate.edu

9:00 a.m.
Forbidden Families of Configurations.
Richard P Anstee*, UBC Mathematics
Christina Koch, UBC Mathematics
(10900555)

9:30 a.m.
Turán and Ramsey Results for Boolean Algebras.
Travis Johnston, University of South Carolina
Linyuan Lu, University of South Carolina
Kevin G. Milans*, West Virginia University
(109005381)

10:00 a.m.
Turán Problems on Nonuniform Hypergraphs.
Linyuan Lu*, University of South Carolina
Travis Johnston, University of South Carolina
(109005420)

10:30 a.m.
Treewidth and Dimension.
Gwenaël Joret, Université Libre de Bruxelles, Belgium
Piotr Micek, Jagiellonian University, Poland
Kevin G Milans, West Virginia University
William T Trotter, Georgia Institute of Technology
Bartosz Walczak, Jagiellonian University, Poland
Ruidong Wang*, Georgia Institute of Technology
(109005125)

Sunday April 28, 2013, 8:00 a.m.9:20 a.m.
Special Session on Generalizations of Nonnegative Matrices and Their Sign Patterns, III
Room 232, Carver Organizers: Minerva Catral, Xavier University catralm@xavier.edu Shaun Fallat, University of Regina Pauline van den Driessche, University of Victoria

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Geometric Elliptic and Parabolic Partial Differential Equations, III
Room 128, Carver Organizers: Brett Kotschwar, Arizona State University kotschwar@asu.edu Xuan Hien Nguyen, Iowa State University

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Graphs, Hypergraphs and Counting, III
Room 274, Carver Organizers: Eva Czabarka, University of South Carolina czabarka@math.sc.edu Laszlo Szekely, University of South Carolina

8:00 a.m.
On Erdős' unit distances problem.
Jozsef Solymosi*, University of British Columbia
(109005281)

9:00 a.m.
Bijective proofs of Jensen's identity and MohantyHanda's identity.
Nicholas A. Loehr*, Virginia Tech Dept. of Math and USNA Dept. of Math
R. Daniel Mauldin, University of North Texas Dept. of Mathematics
(109005103)

9:30 a.m.
High order phase transition in random hypergraphs.
Linyuan Lu, Department of Mathematics, University of South Carolina
Xing Peng*, Department of Mathematics, University of California, San Diego
(109005121)

10:00 a.m.
2colorability of hypergraphs using commutative algebra.
L. Thoma*, Department of Mathematics, University of Rhode Island
(10900533)

10:30 a.m.
Chromatic Numbers of Copoint Graphs of Convex Geometries.
Jonathan E Beagley, Department of Mathematical Sciences, George Mason University
Walter D Morris*, Department of Mathematical Sciences, George Mason University
(10900519)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Kinetic and Hydrodynamic PDEbased Descriptions of Multiscale Phenomena, III
Room 160, Carver Organizers: James Evans, Iowa State University Hailiang Liu, Iowa State University Eitan Tadmor, University of Maryland tadmor@cscamm.umd.edu

8:00 a.m.
Relative entropy, stability of shocks for conservation laws, and applications to asymptotic limits.
Alexis F. Vasseur*, University of Texas at Austin
Kyudong Choi, University of Wisconsin at Madison
Nicholas Leger, Carnegie Mellon
(109035430)

9:00 a.m.
A class of nonlocal conservation laws: local wellposedness and subthresholds for finite time shock formation.
Yongki Lee*, Department of Mathematics, Iowa State University
Hailiang Liu, Department of Mathematics, Iowa State University
(109035286)

9:30 a.m.
Critical thresholds on compressible Eulerian dynamics with nonlocal alignment.
Changhui Tan*, University of Maryland
(109035392)

10:00 a.m.
Compressible NavierStokes equations with temperature dependent dissipation.
Ronghua Pan*, Georgia Institute of Technology
Weizhe Zhang, Georgia Institute of Technology
(109035391)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on MultiDimensional Dynamical Systems, III
Room 190, Carver Organizers: Jayadev Athreya, University of Illinois, UrbanaChampaign jathreya@illinois.edu Jonathan Chaika, University of Chicago Joseph Rosenblatt, University of Illinois at UrbanaChampaign

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Numerical Analysis and Scientific Computing, III
Room 150, Carver Organizers: Hailiang Liu, Iowa State University hliu@iastate.edu Songting Luo, Iowa State University James Rossmanith, Iowa State University Jue Yan, Iowa State University

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Operator Algebras and Topological Dynamics, III
Room 4, Carver Organizers: Benton L. Duncan, North Dakota State University benton.duncan@ndsu.edu Justin R. Peters, Iowa State University

8:00 a.m.
Simplicity of etale groupoid C*algebras.
Jonathan Henry Brown*, Kansas State University
(10904666)

9:00 a.m.
Bimodules over Cartan Algebras in von Neumann Algebras and an Assertion of Mercer.
Jan Cameron, Vassar College
David R Pitts*, University of NebraskaLincoln
Vrej Zarikian, U. S. Naval Academy
(109047189)

9:30 a.m.
The Lattice of BuresClosed Bimodules in Cartan Pairs.
Adam H. Fuller*, University of Nebraska  Lincoln
David R. Pitts, University of Nebraska  Lincoln
(109047310)

10:00 a.m.
States on kGraph C*algebras.
Jonathan H Brown, Kansas State University
Gabriel Nagy, Kansas State University
Sarah A Reznikoff*, Kansas State University
(109046415)

10:30 a.m.
Subspaces of vN(G) and bimodules over maximal abelian selfadjoint algebras.
M. Anoussis, Department of Mathematics, University of the Aegean, Samos, Greece
A. Katavolos*, Department of Mathematics, University of Athens, Greece
I. G. Todorov, Pure Mathematics Research Centre, Queen's University Belfast, United Kingdom
(109047131)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Partial Differential Equations, III
Room 204, Carver Organizers: Gary Lieberman, Iowa State University Paul Sacks, Iowa State University psacks@iastate.edu Mahamadi Warma, University of Puerto Rico at Rio Piedras

8:00 a.m.
Finite energy function spaces on exterior regions.
Qi Han*, Math Department, University of Houston
Giles Auchmuty, Math Department, University of Houston
(10903516)

8:30 a.m.
Regularization of steady point vortices for the ideal fluids.
Daomin CAO*, Institute of Applied Mathematics,Chinese Academy of Sciences,P.R.China
(10903596)

9:00 a.m.
Regularity criteria of Ndimensional porous media equation in terms of one partial derivative or pressure scalar field.
Kazuo Yamazaki*, Department of Mathematics, Oklahoma State University
(10903506)

9:30 a.m.
Slightly supercritical dissipative operators related to 2D Boussinesq equations.
Lizheng Tao*, Oklahoma State University
Durga K.C., Oklahoma State University
Dipendra Regmi, Oklahoma State University
Jiahong Wu, Oklahoma State University
(10903586)

10:00 a.m.
Global Wellposedness for 2D Radial Schrödinger Maps into the Sphere.
Eva Hang Koo*, University of Iowa
Stephen Gustafson, University of British Columbia
(109035274)

10:30 a.m.
A nonlinear movingboundary parabolichyperbolic problem arising in blood flow modeling: a constructive existence proof.
Suncica Canic*, University of Houston
Boris Muha, University of Zagreb
(10903536)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Probabilistic and Multiscale Modeling Approaches in Cell and Systems Biology, III
Room 202, Carver Organizers: Jasmine Foo, University of Minnesota Anastasios Matzavinos, Iowa State University tasos@iastate.edu

8:00 a.m.
A delay differential equation model of combination chemotherapy targeting ovarian cancers.
Harsh Jain*, Mathematics, Florida State University
Alan Richardson, ISTM, Keele University, UK
Helen Byrne, OCCAM and Computer Science, University of Oxford, UK
(109092341)

9:00 a.m.
Numerical methods for chemotaxis models.
Yekaterina Epshteyn*, University of Utah
(109065122)

10:00 a.m.
The Effects of Cyclic Loading on Articular Cartilage Lesion Formation.
Xiayi Wang, University of Iowa
Bruce P. Ayati*, University of Iowa
Jason M. Graham, University of Scranton
Prem S. Ramakrishnan, University of Iowa
James A. Martin, University of Iowa
(109092268)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Quasigroups, Loops, and Nonassociative Division Algebras, III
Room 68, Carver Organizers: C. E. Ealy, Jr., Western Michigan University clifton.e.ealy@wmich.edu Benjamin Phillips, University of Michigan Dearborn J. D. Phillips, Northern Michigan University Petr Vojtechovsky, University of Denver

8:30 a.m.
Structure Theory of CIGroupoids of BolMoufang Type.
David Failing*, Iowa State University
(109008214)

9:00 a.m.
A class of loops categorically isomorphic to Bruck loops of odd order.
Mark B. Greer*, University of Denver
(109020188)

9:30 a.m.
Dihedrallike constructions of automorphic loops.
Mouna R Aboras*, University of Denver
(10902058)

10:00 a.m.
Magic squares of Lie groups.
Tevian Dray*, Oregon State University
John Huerta, Instituto Superior Tecnico, Lisboa
Joshua Kincaid, Oregon State University
Corinne A. Manogue, Oregon State University
Aaron Wangberg, Winona State University
Robert A. Wilson, Queen Mary, University of London
(109017400)

10:30 a.m.
Loops presented by finite automata.
Michael Kinyon*, University of Denver
Rick M. Thomas, University of Leicester
(109020380)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Ring Theory and Noncommutative Algebra, III
Room 98, Carver Organizers: Victor Camillo, University of Iowa Miodrag C. Iovanov, University of Bucharest and University of Iowa yovanov@gmail.com

8:00 a.m.
Recent progress on clean and strongly clean rings.
Alexander J. Diesl, Wellesley College
Thomas J. Dorsey*, IDA/CCRLa Jolla
(109016425)

8:30 a.m.
Quasipolar and Pseudopolar Matrix Rings.
Alexander J Diesl*, Wellesley College
Thomas J Dorsey, Center for Communications Research
(109016290)

9:00 a.m.
Generalizations of Shoda's Theorem.
Zak Mesyan*, University of Colorado, Colorado Springs
(109016224)

9:30 a.m.
Periodic free resolutions from noncommutative matrix factorizations.
Andrew Conner*, Wake Forest University
Ellen Kirkman, Wake Forest University
W. Frank Moore, Wake Forest University
(109016215)

10:00 a.m.
Jacobson Pairs and Regular Elements.
T.Y. Lam, University of California Berkeley
Pace P. Nielsen*, Brigham Young University
(10901639)

10:30 a.m.
Diophantine Sets of Representations.
Ivo Herzog*, The Ohio State University at Lima
Sonia L'Innocente, University of Camerino
(109016155)

Sunday April 28, 2013, 8:00 a.m.10:50 a.m.
Special Session on Stochastic Processes with Applications to Physics and Control, III
Room 196, Carver Organizers: Jim Evans, Iowa State University evans@ameslab.gov Arka Ghosh, Iowa State University Jon Peterson, Purdue University Alexander Roitershtein, Iowa State University

8:00 a.m.
Smalltime asymptotics of stopped Lévy bridges and simulation schemes with controlled bias.
Jose E FigueroaLopez*, Purdue University
Peter Tankov, Universite ParisDiderot (Paris 7)
(109060358)

8:30 a.m.
Large deviations in multitime scale stochastic systems.
Rohini Kumar*, Wayne State University
Jin Feng, Kansas University
JeanPierre Fouque, University of California, Santa Barbara
(109060265)

9:00 a.m.
Large Deviations for Stochastic Partial Differential Equations Driven by a Poisson Random Measure.
Amarjit Budhiraja, University of North CarolinaChapel Hill
Jiang Chen*, University of North CarolinaChapel Hill
Paul Dupuis, Lefschetz Center for Dynamical Systems, Division of Applied Mathematics, Brown University
(10906008)

9:30 a.m.
Dynamic Scheduling for Markov Modulated Singleserver Multiclass Queueing Systems in Heavy Traffic.
Xin Liu*, University of Minnesota
Arka Ghosh, Iowa State University
Amarjit Budhiraja, University of North Carolina at Chapel Hill
(109060244)

10:00 a.m.
Optimal rate for a queueing system in heavy traffic with superimposed OnOff arrivals.
Arka P Ghosh*, Iowa State University
(109060325)

10:30 a.m.
Accumulation and spread of mutations in a spatially structured population.
Jasmine Foo*, University of Minnesota
(109060339)

Sunday April 28, 2013, 8:00 a.m.10:20 a.m.
Special Session on Topology of 3Manifolds, III
Room 294, Carver Organizers: Marion Campisi, University of Texas at Austin Alexander Zupan, University of Texas at Austin zupan@math.utexas.edu

8:00 a.m.
Almost unknotted graphs: theorems, examples, conjectures.
Scott A. Taylor*, Colby College
Byoungwook Jang, Colby College
Pratap Luitel, Colby College
Alexander Zupan, University of Texas, Austin
(109057254)

8:30 a.m.
Gabai degeneracy and fractional Dehn twist coefficients.
Rachel Roberts*, Washington University in St Louis
William H. Kazez, University of Georgia
(109057292)

9:00 a.m.
High Distance Heegaard Splittings via Dehn Twists.
Michael Yoshizawa*, UC Santa Barbara
(10905776)

9:30 a.m.
A lower bound on the Heegaard genus of amalgamated 3manifolds.
T F Schirmer*, Oklahoma State University
(109057311)

10:00 a.m.
Farey Diagrams, simple closed curves, and multiplication in the Kauffman bracket skein algebra of a punctured torus.
Charles Frohman*, The University of Iowa
(10905799)

Sunday April 28, 2013, 8:00 a.m.10:20 a.m.
Special Session on Zero Forcing, Maximum Nullity/Minimum Rank, and Colin de Verdiere Graph Parameters, III
Room 205, Carver Organizers: Leslie Hogben, Iowa State University and American Institute of Mathematics hogben@aimath.org Bryan Shader, University of Wyoming

8:00 a.m.
Matchings and Minimum Skew Zero Forcing Sets of Some Multipartite Graphs.
Luz M. DeAlba*, Drake University
(109005162)

8:30 a.m.
New perspectives on Rosenfeld's theorem.
Louis Deaett*, Quinnipiac University
(109015185)

9:00 a.m.
Colin de Verdièretype invariants for signed graphs and odd$K_4$ and odd$K^2_3$free signed graphs.
Hein van der Holst*, Georgia State University, Atlanta, Georgia
Marina Arav, Georgia State University, Atlanta, Georgia
Frank Hall, Georgia State University, Atlanta, Georgia
Zhongshan Li, Georgia State University, Atlanta, Georgia
(109005152)

9:30 a.m.
Colin de Verdière Parameters of Chordal Graphs.
Shaun M Fallat*, University of Regina
Lon H Mitchell, American Mathematical Society
(109015109)

10:00 a.m.
Getting something for nothing (using transversality, linear algebra and combinatorics).
Bryan L Shader*, University of Wyoming
(109015204)

Sunday April 28, 2013, 8:30 a.m.10:55 a.m.
Contributed Paper Session I
Room 124, Carver

8:30 a.m.
On computability and complexity of Pierce and Engel expansions.
Iraj Kalantari, Western Illinois University
Mojtaba Moniri*, Western Illinois University
(109003432)

8:45 a.m.
Sums and products of smooth numbers.
David J. Covert*, University of Missouri  Saint Louis
(109011246)

9:00 a.m.
On $(i,j,k)$coloring of sparse graphs.
Andre Raspaud*, LaBRI, Bordeaux University, 351 cours de la Liberation, 33450 TALENCE cedex, FRANCE
(10900553)

9:15 a.m.
Discussion

9:30 a.m.
(0,1)improper coloring of sparse graph.
Jaehoon Kim*, University of Illinois at UrbanaChampaign
Alexandr V Kostochka, University of Illinois at UrbanaChampaign
Xuding Zhu, National Sun Yatsen University
(109005157)

9:45 a.m.
Local Clique Covering of Graphs.
Ramin Javadi, Isfahan University of Technology
Zeinab Maleki*, Isfahan University of Technology and University of Illinois UrbanaChampaign
Behnaz Omoomi, Isfahan University of Technology
(109005247)

10:00 a.m.
Large incidencefree sets in geometries.
Stefaan De Winter*, Michigan Technological University
(109005322)

10:15 a.m.
Edge exchanges and realizations of $k$graphic sequences.
Sarah Behrens*, University of NebraskaLincoln
Catherine Erbes, University of Colorado Denver
Michael Ferrara, University of Colorado Denver
Stephen Hartke, University of NebraskaLincoln
Ben Reiniger, University of Illinois UrbanaChampaign
Hannah Spinoza, University of Illinois UrbanaChampaign
Charles Tomlinson, University of NebraskaLincoln
(109005422)

10:30 a.m.
Lower Bound Techniques for Radio Numbers of Trees.
Katherine Benson*, The University of Iowa
(109005102)

10:45 a.m.
Positive semidefinite maximum nullity and zero forcing number.
Travis Peters*, CulverStockton College
(10901535)

Sunday April 28, 2013, 11:05 a.m.11:55 a.m.
Invited Address
Differentiability of Lipschitz functions and tangents of sets.
Room 1, Carver
Marianna Csörnyei*, University of Chicago
(10902802)

Sunday April 28, 2013, 1:30 p.m.2:20 p.m.
Invited Address
The algebraic structure of perturbative quantum field theory.
Room 1, Carver
Kevin Costello*, Northwestern University
(10900101)

Sunday April 28, 2013, 2:30 p.m.4:50 p.m.
Special Session on Algebraic and Geometric Combinatorics, IV
Room 74, Carver Organizers: Sung Y. Song, Iowa State University sysong@iastate.edu Paul Terwilliger, University of WisconsinMadison

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Analysis, Dynamics and Geometry In and Around Teichmuller Spaces, IV
Room 118, Carver Organizers: Alistair Fletcher, Northern Illinois University Vladimir Markovic, California Institute of Technology Dragomir Saric, Queens College CUNY dragomir.saric@qc.cuny.edu

2:30 p.m.
Extremal metrics for extremal length and modulus of measures.
Matthew Badger*, Stony Brook University
(10904979)

3:00 p.m.
Quasiconformal Motion.
Yunping Jiang, CUNY, Graduate Center and Queens College
Sudeb Mitra, CUNY, Graduate Center and Queens College
Hiroshige Shiga, Tokyo Institute of Technology
Zhe Wang*, CUNY, Bronx Community College
(109030318)

3:30 p.m.
Entropy rigidity in coarse geometry.
Kyle E. Kinneberg*, UCLA
(10905190)

4:00 p.m.
Expansion and compression principles in quasiconformal mapping theory.
Christopher J. Bishop, Stony Brook University
Hrant Hakobyan*, Kansas State University
(109030412)

Sunday April 28, 2013, 2:30 p.m.3:50 p.m.
Special Session on Commutative Ring Theory, IV
Room 18, Carver Organizers: Michael Axtell, University of St. Thomas Joe Stickles, Millikin University jstickles@millikin.edu

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Computability and Complexity in Discrete and Continuous Worlds, IV
Room 290, Carver Organizers: Jack Lutz, Iowa State University Tim McNicholl, Iowa State University mcnichol@iastate.edu

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Extremal Combinatorics, IV
Room 268, Carver Organizers: Steve Butler, Iowa State University Ryan Martin, Iowa State University rymartin@iastate.edu

2:30 p.m.
Reversal Ratio and Linear Extension Diameter.
Graham Brightwell, London School of Economics and Political Science
Mitchel T. Keller*, University of NebraskaLincoln
(109006384)

3:00 p.m.
Edgedisjoint rainbow spanning tees in complete graphs.
James M Carraher*, University of NebraskaLincoln
Stephen G Hartke, University of NebraskaLincoln
Paul Horn, Harvard University
(109005111)

3:30 p.m.
Hypergraph Coloring with Hyperspectra.
Franklin H. J. Kenter*, University of California, San Diego
Michael Tait, University of California, San Diego
(109015332)

4:00 p.m.
Sum list coloring, the sum choice number, and scgreedy graphs.
Michelle A Lastrina*, Dickinson College
Michael Young, Iowa State University
(109005284)

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Kinetic and Hydrodynamic PDEbased Descriptions of Multiscale Phenomena, IV
Room 160, Carver Organizers: James Evans, Iowa State University Hailiang Liu, Iowa State University Eitan Tadmor, University of Maryland tadmor@cscamm.umd.edu

Sunday April 28, 2013, 2:30 p.m.3:50 p.m.
Special Session on Numerical Analysis and Scientific Computing, IV
Room 150, Carver Organizers: Hailiang Liu, Iowa State University hliu@iastate.edu Songting Luo, Iowa State University James Rossmanith, Iowa State University Jue Yan, Iowa State University

Sunday April 28, 2013, 2:30 p.m.3:20 p.m.
Special Session on Operator Algebras and Topological Dynamics, IV
Room 4, Carver Organizers: Benton L. Duncan, North Dakota State University benton.duncan@ndsu.edu Justin R. Peters, Iowa State University

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Partial Differential Equations, IV
Room 204, Carver Organizers: Gary Lieberman, Iowa State University Paul Sacks, Iowa State University psacks@iastate.edu Mahamadi Warma, University of Puerto Rico at Rio Piedras

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Probabilistic and Multiscale Modeling Approaches in Cell and Systems Biology, IV
Room 202, Carver Organizers: Jasmine Foo, University of Minnesota Anastasios Matzavinos, Iowa State University tasos@iastate.edu

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Quasigroups, Loops, and Nonassociative Division Algebras, IV
Room 68, Carver Organizers: C. E. Ealy, Jr., Western Michigan University clifton.e.ealy@wmich.edu Benjamin Phillips, University of Michigan Dearborn J. D. Phillips, Northern Michigan University Petr Vojtechovsky, University of Denver

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Stochastic Processes with Applications to Physics and Control, IV
Room 196, Carver Organizers: Jim Evans, Iowa State University evans@ameslab.gov Arka Ghosh, Iowa State University Jon Peterson, Purdue University Alexander Roitershtein, Iowa State University

2:30 p.m.
Wave and droplet solutions for a spatial epidemic model exhibiting a discontinuous transition to an allhealthy state.
ChiJen Wang*, Ames LaboratoryUSDOE, Departments of Mathematics, Iowa State University
DaJiang Liu, Ames LaboratoryUSDOE
James W. Evans, Ames LaboratoryUSDOE, Departments of Mathematics and Physics & Astronomy, Iowa State University
(109060307)

3:00 p.m.
Extraordinary variability and sharp transitions in a maximally frustrated dynamic network.
Wenjia Liu*, Department of Physics, Virginia Tech and Department of Physics and Astronomy, Iowa State University
Beate Schmittmann, Department of Physics, Virginia Tech and Department of Physics and Astronomy, Iowa State University
R. K. P. Zia, Department of Physics, Virginia Tech and Department of Physics and Astronomy, Iowa State University
(109060124)

3:30 p.m.
Fluctuations and 1D decay during coarsening in 2D anisotropic systems.
Yong Han*, Department of Physics and Astronomy, Iowa State University
Selena M. Russell, Department of Chemistry, Iowa State Unversity
Patricia A. Thiel, Departments of Chemistry, and Materials Science & Engineering, Iowa State University; Ames Laboratory  USDOE
James W. Evans, Department of Physics and Astronomy, Iowa State University; Ames Laboratory  USDOE
(109060223)

4:00 p.m.
Ontological models for quantum theory: some recent perspectives.
Raffaele Romano*, Iowa State University, Department of Mathematics
(10908107)

Sunday April 28, 2013, 2:30 p.m.4:20 p.m.
Special Session on Topology of 3Manifolds, IV
Room 294, Carver Organizers: Marion Campisi, University of Texas at Austin Alexander Zupan, University of Texas at Austin zupan@math.utexas.edu

Sunday April 28, 2013, 2:30 p.m.3:55 p.m.
Contributed Paper Session II
Room 124, Carver

2:30 p.m.
Graded Primary Submodules Over Multiplication Modules.
Malik Bataineh*, Jordan University of Science and Technology. Irbid  Jordan
Ala' Khazaaleh, Jordan University of Science and Technology. Irbid  Jordan
(109013150)

2:45 p.m.
Embedded annuli and Jones' conjecture.
Douglas J LaFountain*, Western Illinois University
William W Menasco, University at Buffalo
(109057226)

3:00 p.m.
Weighted Composition Operators between Weighted Bergman and $S^{p}$ Spaces.
Waleed K. AlRawashdeh*, Montana Tech
(109046158)

3:15 p.m.
Resonant instability and nonlinear wave interactions in electrically forced jets.
Saulo Orizaga*, Iowa State University
Lisheng Hou, Iowa State University
Daniel N RIahi, University of Illinois Urbana Champaign, University of Texas PanAmerican
(109076439)

3:30 p.m.
Exact Lie algebraic conditions for the indirect controllability of quantum mechanical systems.
Francesca Albertini, Dipartimento di Matematica Pura ed Applicata, Universita' di Padova, Italy
Domenico D'Alessandro*, Department of Mathematics, Iowa State University
Raffaele Romano, Department of Mathematics, Iowa State University
(109093421)

3:45 p.m.
Geometric Figures as Sets of Parallel, Convergent and Divergent Plane Surfaces.
Stewart Ernest Brekke*, none
(10900042)
Inquiries: meet@ams.org

