Previous Conferences & Workshops

Dec
12
2011

Computer Science/Discrete Mathematics Seminar I

Monotone Unification Problems
11:15am|S-101

Given two monotone polynomials f,g, their unifier is a pair of monotone polynomials u,v such that f=cu+v and g=u+cv, for some c>0. The problem I will discuss is: can we have monotone polynomials f,g which have a unifier, they can be computed by a...

Dec
09
2011

Joint IAS/Princeton University Symplectic Geometry Seminar

Bihermitian Metrics and Poisson Deformations
4:30pm|Fine Hall -- Room 322

A bihermitian metric (or generalized Kahler structure) involves a pair of complex structures and a metric compatible with both. The study of these is closely related to that of holomorphic Poisson structures on a manifold. A deformation theorem for...

Dec
08
2011

Joint IAS/Princeton University Number Theory Seminar

Weights in a Serre-Type Conjecture for U(3)
4:30pm|Fine Hall -- 214

We consider a generalization of Serre's conjecture for irreducible, conjugate self-dual Galois representations rho : G_F --> GL_3(\bar F_p), where F is an imaginary quadratic field in which p splits. We previously gave a conjecture for the possible...

Dec
07
2011

Workshop on Topology: Identifying Order in Complex Systems

Why Things Don't Fall Down, How Tensegrities Work
Robert Connelly
2:00pm|Princeton Univ., Jadwin Hall, Prin. Center for Theoretical Sciences

How do things hold up? What are the geometric ideas that are involved? One of the principles can be seen with simple models, where sticks are suspended in mid-air with inextendable cables. These were called tensegrities by Buckminster Fuller...

Dec
06
2011

Analysis Seminar

On the Ergodic Properties of Square-Free Numbers
2:30pm|S-101

I shall explain the structure of correlation functions for square-free numbers and describe a 'natural' dynamical system associated to them. Spectral analysis allows us to show that this system is metrically isomorphic to a translation on a compact...