Previous Conferences & Workshops

May
11
2020

Computer Science/Discrete Mathematics Seminar I

Using discrepancy theory to improve the design of randomized controlled trials
Daniel Spielman
11:00am|https://theias.zoom.us/j/360043913

 

In randomized experiments, such as a medical trials, we randomly assign the treatment, such as a drug or a placebo, that each experimental subject receives. Randomization can help us accurately estimate the difference in treatment effects with...

May
08
2020

Joint IAS/Princeton/Montreal/Paris/Tel-Aviv Symplectic Geometry Zoominar

Spectral characterizations of Besse and Zoll Reeb flows
Marco Mazzucchelli
9:00am|https://princeton.zoom.us/j/745635914

In this talk, I will address a geometric inverse problem from contact geometry: is it possible to recognize whether all orbits of a given Reeb flow are closed from the knowledge of the action spectrum? Borrowing the terminology from Riemannian...

May
07
2020

Joint IAS/Princeton University Number Theory Seminar

On triple product L functions
Jayce Robert Getz
4:30pm|https://theias.zoom.us/j/959183254

Establishing the conjectured analytic properties of triple product L-functions is a crucial case of Langlands functoriality. However, little is known. I will present work in progress on the case of triples of automorphic representations on GL_3; in...

May
07
2020

Theoretical Machine Learning Seminar

Learning probability distributions; What can, What can't be done
Shai Ben-David
3:00pm|Remote Access Only - see link below

A possible high level description of statistical learning is that it aims to learn about some unknown probability distribution ("environment”) from samples it generates ("training data”). In its most general form, assuming no prior knowledge and...

May
06
2020

Mathematical Conversations

Discrepancy Theory and Randomized Controlled Trials
Daniel Spielman
5:30pm|Remote Access Only

Discrepancy theory tells us that it is possible to partition vectors into sets so that each set looks surprisingly similar to every other. By "surprisingly similar" we mean much more similar than a random partition. Randomized Controlled Trials are...

May
05
2020

Theoretical Machine Learning Seminar

Boosting Simple Learners
12:00pm|Remote Access Only - see link below

We study boosting algorithms under the assumption that the given weak learner outputs hypotheses from a class of bounded capacity. This assumption is inspired by the common convention that weak hypotheses are “rules-of-thumbs” from an “easy-to-learn...

May
05
2020

Computer Science/Discrete Mathematics Seminar II

Recent Progress on Cutting Planes Proofs
Noah Fleming
10:30am|https://theias.zoom.us/j/360043913

 

Proof Complexity studies the length of proofs of propositional tautologies in various restricted proof systems. One of the most well-studied is the Cutting Planes proof system, which captures reasoning which can be expressed using linear...

May
04
2020

Computer Science/Discrete Mathematics Seminar I

Local Statistics, Semidefinite Programming, and Community Detection
Prasad Raghavendra
11:00am|https://theias.zoom.us/j/360043913

We propose a new hierarchy of semidefinite programming relaxations for inference problems. As test cases, we consider the problem of community detection in block models. The vertices are partitioned into k communities, and a graph is sampled...

May
04
2020

Analysis Seminar

Exponential mixing of 3D Anosov flows
11:00am|https://theias.zoom.us/j/562592856

We show that a topologically mixing C^\infty Anosov flow on a 3 dimensional compact manifold is exponential mixing with respect to any equilibrium measure with Holder potential. This is a joint work with Masato Tsujii.

May
01
2020

Joint IAS/Princeton/Montreal/Paris/Tel-Aviv Symplectic Geometry Zoominar

Zoll contact forms are local maximisers of the systolic ratio
Alberto Abbondandolo
9:00am|https://princeton.zoom.us/j/745635914

 

A central question from systolic geometry is to find upper bounds for the systolic ratio of a Riemannian metric on a closed $n$-dimensional manifold, i.e. the ratio of the $n$-th power of the shortest length of closed geodesics by the volume...