Previous Conferences & Workshops

Jan
30
2017

Members’ Seminar

Homological versus Hodge-theoretic mirror symmetry
2:00pm

I'll describe joint work with Sheel Ganatra and Nick Sheridan which rigorously establishes the relationship between different aspects of the mirror symmetry phenomenon for Calabi-Yau manifolds. Homological mirror symmetry---an abstract, categorical...

Jan
30
2017

Computer Science/Discrete Mathematics Seminar I

Quantifying tradeoffs between fairness and accuracy in online learning
Aaron Roth
11:15am

In this talk, I will discuss our recent efforts to formalize a particular notion of “fairness” in online decision making problems, and study its costs on the achievable learning rate of the algorithm. Our focus for most of the talk will be on the...

Jan
27
2017

Working Seminar on Representation Theory

A Gelfand-Graev Formula and Stable Transfer Factors for $mathrm{SL}_n$
Daniel Johnstone
2:00pm

A result of Gelfand and Graev shows that the supercuspidal representations of $\mathrm{SL}_2$ are neatly parameterized by characters of elliptic tori, and that the stable character data for all such representations may be collected into a single...

Jan
25
2017

Mathematical Conversations

Voevodsky's Univalent Foundations for mathematics
Daniel Grayson
6:00pm

We'll take a glance at the world of mathematics as viewed through the Univalent Foundations of Voevodsky. In it, "set" and "proposition" are defined in terms of something more fundamental: "type". The formal language fulfills the mathematicians'...

Jan
25
2017

Analysis/Mathematical Physics Seminar

Large coupling asymptotics for the Lyapunov exponent of quasi-periodic Schrödinger operators with analytic potentials
Christoph Marx
1:30pm

In this talk we will quantify the coupling asymptotics for the Lyapunov exponent (LE) of a one-frequency quasi-periodic Schrödinger operator with analytic potential sampling function. By proving an asymptotic formula for the LE valid for all...

Jan
24
2017

Special Mathematical Physics Seminar

Reinforced random walks and statistical physics
Pierre Tarres
1:30pm

We explain how the Edge-reinforced random walk, introduced by Coppersmith and Diaconis in 1986, is related to several models in statistical physics, namely the supersymmetric hyperbolic sigma model studied by Disertori, Spencer and Zirnbauer (2010)...

Jan
24
2017

Computer Science/Discrete Mathematics Seminar II

Robust sensitivity
10:30am

The sensitivity conjecture is a famous open problem in the theory of boolean functions. Let $f$ be a boolean function defined on the hypercube. The sensitivity of a node $x$ is the number of its neighbours in the hypercube, for which $f$ give the...

Jan
23
2017

Members’ Seminar

Combinatorics of the amplituhedron
2:00pm

The tree amplituhedron $A(n,k,m)$ is the image in the Grassmannian $Gr(k,k+m)$ of the totally nonnegative part of $Gr(k,n)$, under a (map induced by a) linear map which is totally positive. It was introduced by Arkani-Hamed and Trnka in 2013 in...

Jan
23
2017

Computer Science/Discrete Mathematics Seminar I

Active learning with \"simple\" membership queries
11:15am

An active learning algorithm for a classification problem has access to many unlabelled samples. The algorithm asks for the labels of a small number of samples, carefully chosen, such that that it can leverage this information to correctly label...