Previous Conferences & Workshops

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.

Feb
24
2021

Mathematical Conversations

Space vectors forming rational angles
Bjorn Poonen
5:30pm|Remote Access

In 1895, Hill discovered a $1$-parameter family of tetrahedra whose dihedral angles are all rational multiples of $\pi$. In 1976, Conway and Jones related the problem of finding all such tetrahedra to solving a polynomial equation in roots of unity...

Feb
24
2021

Geometric and Modular Representation Theory Seminar

The affine Hecke category is a monoidal colimit
James Tao
3:00pm|Simonyi Hall 101 and Remote Access

We will discuss the following theorems concerning colimits taken in the infinity-category of monoidal DG-categories. (No familiarity with infinity-categories will be required or assumed.) The affine Hecke category is the monoidal colimit of its...

Feb
24
2021

Stability and Testability

Norm stability in the unitary case from Voiculescu to Gromov-Lawson
Shmuel Weinberger
11:00am|Remote Access

This expository talk will try to bridge the first examples of "almost commuting" unitary matrices that are not almost "commuting unitaries" due to Voiculescu to a more sophisticated and very beautiful construction of examples by Gromov and Lawson in...

Feb
23
2021

SL2 Seminar

Billiards and Boats
Lars Thorge Jensen
3:00pm|Remote Access

In this talk we will present two perspectives on the p-Kazhdan-Lusztig basis and its combinatorics, giving a glimpse of its complexity. This talk does not provide many answers, but will hopefully raise many interesting questions and is based on...

Feb
23
2021

Computer Science/Discrete Mathematics Seminar II

Introduction to Laplacian Linear Systems for Undirected Graphs
John Peebles
10:30am|Remote Access - see Zoom link below

This talk gives an introduction on how to quickly solve linear systems where the matrix of the system is the Laplacian matrix of any undirected graph. No prior familiarity with optimization is assumed. In the process, we will cover:

  • what positive...
Feb
22
2021

Analysis Seminar

Spread of infections in random walkers
Allan Sly
4:30pm|Remote Access

We consider a class of interacting particle systems with two types, A and B which perform independent random walks at different speeds. Type A particles turn into type B when they meet another type B particle. This class of systems includes models...