Previous Conferences & Workshops

Mar
03
2021

Stability and Testability

Topological obstructions to matrix stability of discrete groups
Marius Dadarlat
11:00am|Remote Access
A discrete countable group is matricially stable if its finite dimensional approximate unitary representations are perturbable to genuine representations in the point-norm topology. We aim to explain in accessible terms why matricial stability for a...
Mar
02
2021

Computer Science/Discrete Mathematics Seminar II

Solving Laplacian Systems of Directed Graphs
John Peebles
10:30am|Remote Access - see Zoom link below

This talk introduces a directed analog of the classical Laplacian matrix and discusses algorithms for solving certain problems related to them. Of particular interest is that using such algorithms, one can compute the stationary distribution of a...

Mar
01
2021

Analysis Seminar

Graph comparison
Anton Petrunin
4:30pm|Remote Access

I will survey results related to graph comparison; graph comparison is a certain type of restriction on a metric spaces which is encoded by a given graph.

Mar
01
2021

Members’ Seminar

The Value of Errors in Proofs
Avi Wigderson
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
01
2021

Computer Science/Discrete Mathematics Seminar I

Rainbow structures, Latin squares & graph decompositions
Benny Sudakov
11:15am|Remote Access - see Zoom link below

A subgraph of an edge-coloured graph is called rainbow if all its edges have distinct colours.  The study of rainbow subgraphs goes back to the work of Euler on Latin squares in the 18th century.  Since then rainbow structures were the focus of...

Feb
26
2021

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

Twisted generating functions and the nearby Lagrangian conjecture
Sylvain Courte
9:15am|Remote Access

I will explain the notion of twisted generating function and show that a closed exact Lagrangian submanifold $L$ in the cotangent bundle of $M$ admits such a thing. The type of function arising in our construction is related to Waldhausen's tube...

Feb
25
2021

Joint IAS/Princeton University Number Theory Seminar

Selmer groups and a Cassels-Tate pairing for finite Galois modules
Alexander Smith
4:30pm|Remote Access

I will discuss some new results on the structure of Selmer groups of finite Galois modules over global fields. Tate's definition of the Cassels-Tate pairing can be extended to a pairing on such Selmer groups with little adjustment, and many of the...

Feb
25
2021

Quantum Groups Seminar

R-matrices
Elijah Bodish
4:00pm|Remote Access

Continuation of the talk from last time.