Previous Conferences & Workshops

Oct
15
2015

Joint IAS/Princeton University Number Theory Seminar

Adjoint Selmer groups for polarized automorphic Galois representations
4:30pm|S-101

Given the $p$-adic Galois representation associated to a regular algebraic polarized cuspidal automorphic representation, one naturally obtains a pure weight zero representation called its adjoint representation. Because it has weight zero, a...

Oct
13
2015

Geometric Structures on 3-manifolds

The four-color theorem and an instanton invariant for spatial graphs II
4:00pm|S-101

Given a trivalent graph embedded in 3-space, we associate to it an instanton homology group, which is a finite-dimensional $\mathbf{Z}/2$ vector space. The main result about the instanton homology is a non-vanishing theorem, proved using techniques...

Oct
13
2015

Geometric Structures on 3-manifolds

The four-color theorem and an instanton invariant for spatial graphs I
Peter Kronheimer
2:00pm|S-101

Given a trivalent graph embedded in 3-space, we associate to it an instanton homology group, which is a finite-dimensional $\mathbf{Z}/2$ vector space. The main result about the instanton homology is a non-vanishing theorem, proved using techniques...

Oct
13
2015

Computer Science/Discrete Mathematics Seminar II

Non-constructive combinatorics
10:30am|S-101

I will describe several old and new applications of topological and algebraic methods in the derivation of combinatorial results. In all of them the proofs provide no efficient solutions for the corresponding algorithmic problems. Finding such...

Oct
12
2015

Members’ Seminar

3-manifold groups
2:00pm|S-101

I'll review recent progress on properties of 3-manifold groups, especially following from geometric properties. Then I'll discuss some open questions regarding 3-manifold groups, including their profinite completions, torsion in covers, orderability...

Oct
12
2015

Computer Science/Discrete Mathematics Seminar I

Factors of polynomials of low individual degree
Rafael Oliveira
11:15am|S-101

In [kal89], Kaltofen proved the remarkable fact that multivariate polynomial factorization can be done efficiently, in randomized polynomial time. Still, more than twenty years after Kaltofen's work, many questions remain unanswered regarding the...

Oct
09
2015

Joint IAS/Princeton University Symplectic Geometry Seminar

Real Gromov-Witten theory in all genera
Penka Georgieva
1:45pm|Fine 322, Princeton University

We construct positive-genus analogues of Welschinger's invariants for many real symplectic manifolds, including the odd-dimensional projective spaces and the quintic threefold. Our approach to the orientability problem is based entirely on the...