- Programs
- MASS Colloquia

- Fibonacci or not? New and old research on phyllotaxis

Christophe Golé, Smith College
- How to count spanning trees

Anton Petrunin, Penn State
- The Man Who Knew Infinity: the Movie, the Man, and the Mathematics

George Andrews, Penn State
- Diving into the three-body problem

Richard Montgomery, UC Santa Cruz
- Tricks and methods in search for integrable systems

Vladimir Matveev, Friedrich-Schiller-University, Jena, Germany
- How to pick a random matrix?

Igor Rivin, Temple University
- On the large-scale description of periodic structures, using only elementary topology and analysis

Dmitry Burago, Penn State
- Number theory, dynamical systems and Benford's law

Gil Bor, CIMAT, Mexico
- Cyclic competition, evolutionary games, and escaping extinction

Andrew Belmonte, Penn State
- On Monoids and McNuggets

Scott Chapman, Sam Houston State University

You Think You Know the Pythagorean Theorem? Think Again!

Robert Foote, Wabash College
Knowing When to Stop

Theodre Hill, Georgia Institute of Technology
Partitions, Compositions, and the Excitement of Ramanujan

George Andrews, Penn State
The length and width of space curves

Mohammad Ghomi, Georgia Institute of Technology
Billiard table as a mathematician’s playground

Anatole Katok, Penn State
Identities

Bruce Berndt, University of Illinois Urbana-Champaign
Solving polynomial congruences

Dmitry Fuchs, University of California, Davis
History of the soliton

Ronald Perline, Drexel University
Visual mathematics: From graph partitioning to cellular automata and fair allocation

Yuval Peres, Microsoft Research
Roots through history

Norbert Schappacher, University of Strasbourg, France
x^n + x + a

Kumar Murty, University of Toronto
Two revealing programs

Richard Schwartz , Brown University

A tour of Pritchard Lab

Diane Henderson, Penn State
Congruences for Fishburn Numbers

James Sellers, Penn State
Real enumeration problems

Oleg Viro, Stony Brook University
Rectangling the square

Aaron Abrams, Washington and Lee University
Recurrences for Eisenstein series

Larry Rolen, Penn State
Mono-monostatic bodies: the story of the Gömböc

Gábor Domokos, Budapest University of Technology and Ecomonics
Flavor of Morse Theory

Augustin Banyaga, Penn State
Sphere packing in 2.5 dimensions

Ken Stephenson, University of Tennessee
Mechanisms of Chaos

Leonid Bunimovich, Georgia Institute of Technology
Latin squares

Gary Mullen, Penn State
The mathematics of internet search

Gil Bor, Centro de Investigación en Matemáticas, Mexico

Ramanujan, Fibonacci numbers, and Continued Fractions or Why I Took Zeckendorf's Theorem Along On My Last Trip To Canada

George Andrews, Penn State University
Introduction to Entropy

Yuri Suhov, Penn State / University of Cambridge, UK
Commutative implies associative?

John Roe, Penn State University
The William Pritchard Fluid Mechanics Laboratory

Vishal Vasan, Penn State University
Stimulus space geometry and topology from neural activity

Carina Curto, Penn State University
Ramsey Theory and Dynamics

Vitaly Bergelson, Ohio State University
Evolution of resistance to white pine blister rust in high-elevation pines

Simon Tavener, Colorado State University
Random walks: simple and self-avoiding

Greg Lawler, University of Chicago
Solutions to polynomials in two variables

Thomas Tucker, University of Rochester
Lengthening the edges of a tetrahedron

Richard Schwartz, Brown University
PDE models of traffic flow

Alberto Bressan, Penn State University

Mathematics through physics

Mark Levi, Penn State University
Some applications of geometry to problems in biology

Joel Hass, UC Davis
Counting collisions in hard ball gas models and singular geometry of non-positive curvature

Dmitri Burago, Penn State University
From flapping birds to space telescopes: the mathematics of origami

Robert Lang, Alamo, CA
The William Pritchard Fluid Mechanics Laboratory

Diane Henderson, Penn State University
About the numbers 12 and 24

Roger Howe, Yale University
Kirkwood gaps and instability for three body problems

Vadim Kaloshin, University of Maryland
Paul Erdos - one of the most influential mathematicians of our times

Krishnaswami Alladi, University of Florida
Adding and counting

Ken Ono, Emory University
Ramanujan

Ken Ono, N/A
Mating habits of polynomials

Sarah Koch, University of Michigan
We vote, but do we get what we want?

Don Saari, UC Irvine

Manhole Covers and Convex Geometry

Tanya Khovanova, Massachusetts Institute of Technology
Markov equation and the most irrational numbers

Alexander Veselov, Loughborough University, UK
5-dimensional geometry is not like 2-dimensional geometry (and 3 and 4 are somewhere in between)

Mark Meckes, Case Western Reserve University
Donald Coxeter: tales of mystery and imagination

Valentin Ovsienko, University of Lyon
A new approach to CRC processing

Donald Newhart, NSA
On the use of computers in Mathematics and Science: the good, the bad, and what we should do about them

Sheldon Newhouse, Michigan State University
Number of collisions of n balls on the infinite billiard table after Burago-Ferleger-Kononenko.

Anton Petrunin, Penn State
Mathematical Puzzles that S-t-r-e-t-c-h Your Intuition

Peter Winkler, Dartmouth College
Some polynomial dynamics systems

Alice Medvedev, UC Berkeley
Seeing Invisible: Mathematics of Medical Imaging

Peter Kuchment, Texas A&M University
A short look at the long history of the lemniscate of Bernoulli

Joel Langer, Case Western Reserve University

Patterns of curves in the plane and piecewise translations

Pat Hooper, CUNY
Visual Differential Geometry and the Hyperbolic Plane

Tristan Needham, University of San Francisco
Combinatorics of Total Positivity

Michael Gekhtman, Notre Dame
Cutting a square into triangles

Aaron Abrams, MSRI/Emory University
The Real, Complete Story of Conics

Frank Sottile, Texas A&M
Geometry and analysis on fractals

Alexandre Kirillov, University of Pennsylvania
“The more things change...”

Chaim Goodman-Strauss, University of Arkansas
The Lost Notebook of Srinivasa Ramanujan

George Andrews, Penn State
Trigonometric identities and the Weyl character formula

Charles Conley, University of North Texas

Hard disks in a box: topology and complexity

Yu. Baryshnikov, Bell Labs
Symmetry, regular solids and quantum field theory

Adrian Ocneanu, Penn State
The rental harmony theorem

David Futer, Temple University
Tilings with rational polygons

Richard Kenyon, Brown University
Amenability of the Thompson group $ and some elementary properties of ^n$

Marl Sapir, Vanderbilt University
Behind the Hofstadter's butterfly: the competition between order and chaos

Svetllana Jitomirskaya, University of California Irvine
Symmetry: From Triangles to Quantum Physics

Kenneth Gross, University of Vermont
Some reflections on mirrors

Ron Perline, Drexel University
Outer Billiards, Polytope Exchange Maps, and Renormalization

Richard Schwartz, Brown University
Capillary surfaces

Robert Finn, Stanford Univrsity
Alexandrov's theorem on development of polyhedron

A. Petrunin, Penn State

Tropical geometry

Ilia Itenberg, University of Strasbourg and MSRI
Using elliptic and hyperelliptic curves in pairing-based cryptography

Kirsten Eisentraeger, Penn State
An Invitation to Minimal Surfaces

Matthias Weber, Indiana University
Discovering and proving theorems by physical reasoning

Mark Levi, Penn State
Minimal surfaces in sub-Riemannian geometry

Luca Capogna, University of Arkansas
[0,1] is not a minimality detector of [0,1]^2

Jon Chaika, N/A
Everything you wanted to know about 2x2 matrices

Svetlana Katok, Penn State
Topological Network Topology

Robert Ghrist, University of Pennsylvania
Topology and Social Choice

S. Weinberger, University of Chocago
Two problems in combinatorial plane geometry

Anton Petrunin, Penn State
Braid groups and their applications

Frederick Cohen, University of Rochester

Theory of Dynamical Systems on service to Number Theory

A. Gogolev, Penn State
The four vertex property and topology of surfaces with constant curvature

M. Ghomi, Georgia Tech
Higher dimensional solutions to low dimensional problems

K. Stolarsky, University of Illinois
The Devil's Pentagram

R. Schwartz, Brown University
Fundamental solutions of differential operators and D-module theory

F. Malikov, University of Southern California
Introduction to Hypergeometric Functions

V. Retakh, Rutgers University
DNA Topology

De Witt Sumners, Florida State University
The discrete square peg problem

I. Pak, University of Minnesota
Cantor and Sierpinski, Julia and Fatou: Crazy Topology in Complex Dynamics

R. Devaney, Boston University
How to Tie Your Unicycle in Knots: An Introduction to Legendrian Knot Theory

Josh Sabloff, Haverford College

Toy modeling

Tadashi Tokieda, University of Cambridge, N/A
Analysis, Geometry and Arithmetics of fractals

Alexadre Kirillov, University of Pennsylvania, N/A
Playing zero-sum games and convex geometry after John Nash

Dmitry Burago, Penn State, N/A
Geometry of Polyhedra

Igor Rivin, Temple University, N/A
Physical proofs of mathematical theorems

Mark Levi, Penn State, N/A
What does the future hold for restricted patterns?

Zvezdelina Stankova, Mills College, N/A
From the Fundamental Theorem of Algebra to astrophysics: a "harmonious" journey

Dmitry Khavinson, University of South Florida, N/A
Can understanding cancer be translated into effective anticancer therapy?

Andrei Gudkov, Roswell Park Cancer Institute, Buffalo, NY, N/A
Hilbert's Tenth over Subrings of Q

Alexandra Shlapentokh, East Carolina University, N/A
A Glimpse of Several Complex Variables

Steven Krantz, American Institute of Mathematics, N/A
Inverse problems in Arithmetic Combinatorics

Alexander Razborov, Institute for Advanced Study, N/A

**"Uniform Distribution: from Diophantine approximations to ergodic theorems"**

Vitaly Bergelson, Ohio State University
**"Virtual links and ribbon graphs"**

Sergei Chmutov, Ohio State University
**"Packing discs in the plane"**

Ronald Graham, University of California, San Diego
**Noncrossing partitions, meanders, and the fundamental theorem of algebra**

David Savitt, University of Arizona
**Direct methods in the calculus of variations**

Paul Rabinowitz, University of Wisconsin
**Classification of Legendrian Knots and Links**

Lisa Traynor, Bryn Mawr College
**Bending polyhedra**

Yuri Burago, Steklov Institute (St. Petersburg, Russia)
**The Integral Octonions (That Funny Number System)**

Derek Smith, Lafayette College
**Topology of algebraic curves and surfaces (Hilbert's 16th problem and beyond)**

Nikita Netsvetaev, St. Petersburg University (St. Petersburg, Russia)

**"Gravity-defying phenomena"**

Mark Levi, Penn State University
**"How old was Diophantus's son?"**

Don Zagier, MPI-Bonn & College de France
**"Bugs, Blobs and Roto-Routers"**

James Propp, University of Wisconsin, Madison
**"Schwarzian derivative, projectivity and some applications to rigidity"**

Chengbo Yue, Academy of Mathematical and System Sciences, Chinese Academy of Sciences
**"Mathematics of symmetry in 4 dimensions - a sculpture"**

Adrian Ocneanu, Penn State University
**"New Solutions to the N-body problem"**

Richard Montgomery, University of California, Santa Cruz
**"How many prime factors does a number have?"**

Krishnaswami Alladi, University of Florida
**"Venn Diagrams and Symmetric Chain Decompositions"**

Carla Savage, North Carolina State University
**"Knots, Tangles, DNA and Quantum Physics"**

Louis Kauffman, University of Illinois at Chicago
**"Different facets of linking numbers"**

Boris Khesin, University of Toronto

**"Riemann Mapping Theorem via steepest descent"**

Mark Levi, Penn State University
**"Volume and area formulas"**

Robert Connelly, Cornell University
**"The dynamics of thin flexible things: shaking and breaking"**

Andrew Belmonte, Pennsylvania State University
**"Spontaneous symmetry breaking in a 1-D process with variable length"**

Andre Toom, Universidade Federal de Pernambuco, Brazil
**"What does the limit shape mean in geometry and combinatorics?"**

Anatoly Vershik, St. Petersburg State University and Steklov Institute
**"How many roots does a matrix polynomial equation have?"**

Vladimir Retakh, Rutgers University
**"The dynamics and geometry of microscopic structures in piecewise rotations"**

Aroek Goetz, San Francisco State University
**"Experiments with triangular billiards"**

Richard Schwartz, University of Maryland
**"Polynomials and Knots"**

Walter Neumann, Columbia University
**"On the filtering problem of stationary processes"**

Mariusz Lemanczyk, Nicholas Copernicus University, Torun, Poland

**"Is it possible to cut a tetrahedron into pieces and to assemble a cube? (Hilbert's 3rd Problem)"**

by Dmitry Fuchs, University of California at Davis
**"The Geometry of Spiral Circle Packings"**

by Kenneth Stephenson, University of Tennessee
**"Double bubbles"**

by Frank Morgan, Williams College
**"The SIAM 100 Digit Challenge: Adventures in Numerical Computing"**

by Stanley Wagon, Macalester College
**"Braids, graphs, and robots"**

by Aaron Abrams, University of Georgia
**"Irrationality measures using integration by parts"**

by Krishna Alladi, University of Florida
**"Pascal Triangles in Modular Arithmetic, Entropy and Algebraic Functions"**

by Hillel Furstenberg, Yale University and Hebrew University of Jerusalem
**"Fermionic Integration"**

by A. Vaintrob, University of Oregon

**"Laurent phenomenon"**

by Andrei Zelevinsky, Northeastern University
**"Topological problems in combinatorics"**

by Robin Forman, Rice University
**"On projective duality"**

by Serge Lvovski, Independent University of Moscow
**"Asymptotic lines and the Griffiths-Harris rigidity of compact Hermitian symmetric spaces"**

by Joseph Landsberg, Georgia Institute of Technology
**"The exponential in mathematics and physics"**

by Adrian Ocneanu, Penn State University
**"Impossible Crystals"**

by Roger Penrose, Oxford University and Penn State University
**"Some connections between combinatorics, group theory, topology and computer science"**

by Mark Sapir, Vanderbilt University
**"The Nash Equilibrium"**

by Mikhail Shubin, Northeastern University
**"Iterated exponentials"**

by J. Anderson, Penn State University
**"Enumerative geometry"**

by Mira Bernstein, Wellesley

**"Family Algebras."**

by Alexandre Kirillov, University of Pennsylvania.
**"Integral Lexicographic Codes"**

by John Conway, Princeton University
**"Klein's Erlanger Programme"**

by Augustin Banyaga, Penn State University
**"Virasoro group and projective structures on the circle: a hidden face of an old coin"**

by V. Ovsienko, CNRS, Centre of Theoretical Physics, Luminy, France
**"Vector Calculus and the Topology of Domains in 3-space"**

by Herman Gluck, University of Pennsylvania
**"Minimal surfaces, discrete harmonic analysis, and random walks"**

by Alexei Sossinsky, Independent University of Moscow
**"Physical proofs of mathematical theorems"**

by Mark Levi, Penn State University
**"One hundred years of Hilbert's fourth problem"**

by Juan Carlos Alvarez, New York Polytechnic University
**"Loops in **`R`^{3}: New Angles on an Old Topic"

by Bruce Solomon, Indiana University

**"Knotted Flowlines"**

by Robert Ghrist, Georgia Tech
**"EULER, JACOBI, RAMANUJAN: Interesting Formulae, Beautiful Results and Some Recent Variations."**

by Irwin Kra, State University of New York at Stony Brook
**"Aperiodic Tilings and Computation in the Hyperbolic Plane."**

by Chaim Goodman-Strauss, Princeton University
**"Search Engines and Measurements on the Modular Group."**

by Leonid Polterovich, Tel Aviv University
**"Internet Search and Markov Chains."**

by Michael Brin, University of Maryland
**"The Peano Kernel: Convolving Abstract and Applied Mathematics."**

by Michael Gage, University of Rochester
**"Flexible Polyhedra"**

by Dmitry Fuchs, University of California at Davis
**"The Story of the Rogers-Ramanujan Identitites"**

by G. Andrews, Penn State University
**"The Future of Mathematics"**

by Doron Zeilberger, Temple University

**"The Meaning of Chaos"**

by Greg Swiatek, Penn State
**"When Do Polynomials Have Common Zeros?"**

by Dale Brownawell, Penn State
**"Knots and Knot Invariants"**

by Arkady Vaintrob, University of New Mexico
**"Hilbert's 16th Problem Near Its Centenary"**

by Yulij Ilyashenko, Cornell
**"Replicating Tiles"**

by Viorel Nitica, Notre Dame
**"Nightmares and Dreams of Lyapunov: Stability and Semigroups"**

by Yuri Latushkin, University of Missouri
**"On the Hilbert-Smith Conjecture"**

by Alexander Dranishnikov, Penn State
**"The DNA Geometric Inequality: An Open-ended Story"**

by Serge Tabachnikov, University of Arkansas
**"The Banach-Tarski Paradox and Amenable Groups"**

by Misha Guysinsky, Tufts University
**"Group Reconstruction"**

by Conrad Plaut, University of Tennessee

**"Rational numbers, right triangles, and elliptic curves"**

by Karl Rubin, Stanford University
**"Bicycle wheels, Gauss-Bonnet formula and Berry's phase"**

by Mark Levi, Penn State University
**"Why representation theory is interesting and useful?"**

by Alexandre Kirillov, University of Pennsylvania
**"Playing pool with pi"**

by Gregory Galperin, Eastern Illinois University
**"The Life and Work of India's Greatest Mathematician Srinivasa Ramanujan"**

by Bruce Berndt, University of Illinois
**"Mathematics of Fractal Images"**

by Yakov Pesin, Penn State University
**"An Introduction to K-theory"**

by Paul Baum, Penn State University
**"Arithmetic Curves and Triangulations"**

by Fedor Bogomolov, Courant Institute
**"Social Life of Curves"**

by Simon Gindikin, Rutgers University