Seminars Sorted by Series

Members’ Seminar

Feb
08
2021

Members’ Seminar

The top-heavy conjecture for vectors and matroids
2:00pm|Simonyi Hall 101 and Remote Access

A 1948 theorem of de Bruijn and Erdős says that if $n$ points in a projective plane do not lie all on a line, then they determine at least n lines. More generally, Dowling and Wilson conjectured in 1974 that for any finite set of vectors spanning a...

Feb
15
2021

Members’ Seminar

No seminar: Presidents' Day
2:00pm|Simonyi Hall 101 and Remote Access
Feb
22
2021

Members’ Seminar

Astrophysical fluid dynamics
2:00pm|Simonyi Hall 101 and Remote Access

Most of the visible matter in the Universe is a plasma, that is a dilute gas of ions, electrons, and neutral atoms. In many circumstances, the dynamics of this plasma can be modeled in the continuum limit, using the equations of fluid mechanics...

Mar
01
2021

Members’ Seminar

The Value of Errors in Proofs
2:00pm|Simonyi Hall 101 and Remote Access

A few months ago, a group of theoretical computer scientists posted a paper on the Arxiv with the strange-looking title "MIP* = RE", impacting and surprising not only complexity theory but also some areas of math and physics. Specifically, it...

Mar
08
2021

Members’ Seminar

Higher Representation Theory
2:00pm|Simonyi Hall 101 and Remote Access

New types of symmetries have been considered in algebra and algebraic geometry and a higher analog of representation theory has been developed to answer questions of classical representation theory. Geometric representation theory can be viewed as...

Mar
15
2021

Members’ Seminar

Estimating the mean of a real valued distribution
2:00pm|Simonyi Hall 101 and Remote Access

I revisit the basic statistical problem of estimating the mean of a real-valued distribution. I will introduce an estimator with the guarantee that "our estimator, on *any* distribution, is as accurate as the sample mean is for the Gaussian...

Milnor Conjecture Learning Seminar

Minerva Distinguished Visitor Lectures at Princeton University

Nov
09
2015

Minerva Distinguished Visitor Lectures at Princeton University

I: Geometry and dynamics on hyperbolic surfaces
4:30pm|McDonnell A02, Princeton University

The first lecture will give some background on the geometry and dynamics on hyperbolic surfaces. I will give a brief overview of Teichmüller theory and properties of the mapping class groups and the space of geodesic currents. I will discuss some...

Nov
11
2015

Minerva Distinguished Visitor Lectures at Princeton University

II: Dynamics on moduli spaces of hyperbolic surfaces
4:30pm|McDonnell A02, Princeton University

In the second lecture, I will discuss several natural geometric flows defined on bundles over the moduli spaces of curves. I will describe basic ergodic properties of these flows. I will discuss some open questions and some of the progress made in...

Nov
13
2015

Minerva Distinguished Visitor Lectures at Princeton University

III: Counting mapping class group orbits on hyperbolic surfaces
4:30pm|McDonnell A02, Princeton University

Let $X$ be a complete hyperbolic metric on a surface of genus $g$ with $n$ punctures. In this lecture I will discuss the problem of the growth of $s^{k}_{X}(L)$, the number of closed curves of length at most $L$ on $X$ with at most $k$ self...

Minerva Mini-Course

Oct
23
2015

Minerva Mini-Course

An overview of Benjamini-Schramm convergence in group theory and dynamics
Lewis Bowen
1:30pm|Fine 110, Princeton University

Finite models of infinite groups/actions/manifolds are useful for studying spectral and $L^2$-invariants, constructing random processes and have recently been used to introduce new invariants of group actions useful for proving nonembedding and...

Oct
30
2015

Minerva Mini-Course

$L^2$ invariants and Benjamini-Schramm convergence
Lewis Bowen
1:30pm|Fine 110, Princeton University

Finite models of infinite groups/actions/manifolds are useful for studying spectral and $L^2$-invariants, constructing random processes and have recently been used to introduce new invariants of group actions useful for proving nonembedding and...

Nov
20
2015

Minerva Mini-Course

When does injectivity imply surjectivity?
Lewis Bowen
1:30pm|Fine 110, Princeton University

Finite models of infinite groups/actions/manifolds are useful for studying spectral and $L^2$-invariants, constructing random processes and have recently been used to introduce new invariants of group actions useful for proving nonembedding and...

Nov
23
2015

Minerva Mini-Course

Classification of Bernoulli shifts
Lewis Bowen
4:30pm|Fine 314, Princeton University

Finite models of infinite groups/actions/manifolds are useful for studying spectral and $L^2$-invariants, constructing random processes and have recently been used to introduce new invariants of group actions useful for proving nonembedding and...

Dec
04
2015

Minerva Mini-Course

Ergodic theorems beyond amenable groups
Lewis Bowen
1:30pm|Fine 110, Princeton University

Let $G$ be a locally compact group acting by measure-preserving transformations on a probability space $(X,\mu)$. To every probability measure on $G$ there is an associated averaging operator on $L^p(X,\mu)$. Ergodic theorems describe the pointwise...

Mini conference on Arithmetic Combinatorics

Mini-Course

Oct
10
2007

Mini-Course

Sum-Products Estimates and Applications
2:00pm|S-101

It is an introduction to the topic. We would present a proof of the quantitative sum-product in F^p and the proof of the exponential sum bound + an overview of what's around.

Oct
11
2007

Mini-Course

Inverse Theorems and Random Matrices
2:00pm|S-101

It is an introduction to the topic. We would present several inverse theorems in additive number theory (starting with Freiman's) and some overview about their applications. Next, we discuss the connection between some of these and problems...