University of Chicago Number Theory Seminar

Spring 2017: Tuesday 1:30-2:50pm, Eckhart 206

This is the homepage of the Number Theory Seminar at the University of Chicago. To get on or off the mailing list, you can either go to or contact Jack Shotton.

NOTE: the room for this quarter is Eckhart 206.

Click here to see the location of Eckhart Hall, and here for directions to the University of Chicago.

Click here to see the schedule of previous quarters: Spring 2013 / Fall 2013 / Spring 2014 / Fall 2014 / Winter 2015 / Spring 2015 / Fall 2015 / Winter 2016 / Spring 2016

/ Spring 2016 / Fall 2016 / Winter 2017

Spring 2017 Schedule




March 28

Preston Wake

Pseudorepresentations and the Eisenstein ideal
In his landmark 1976 paper "Modular curves and the Eisenstein ideal", Mazur studied congruences modulo p between cusp forms and an Eisenstein series of weight 2 and prime level N. He proved a great deal about these congruences, but also posed a number of questions: how big is the space of cusp forms that are congruent to the Eisenstein series? How big is the extension generated by their coefficients? In joint work with Carl Wang Erickson, we give an answer to these questions using the deformation theory of Galois pseudorepresentations. The answer is intimately related to the algebraic number theoretic interactions between the primes N and p, and is given in terms of cup products (and Massey products) in Galois cohomology. ( Hide Abstract)

April 4

Evangelia Gazaki

April 11

Nicolas Templier

April 18

Ali Altuğ

April 25

Florian Sprung

May 2


May 9


May 16

Kęstutis Česnavičius

May 23

Brian Smithling
(Johns Hopkins)

May 30


One may also want to check out:

  • Geometric Langlands Seminar Monday and Thursday 4:30pm;
  • Algebraic Geometry Seminar Tuesday 4:30pm;
  • Northwestern University Number Theory Seminar Monday 4pm;
  • UIC Number Theory Seminar Tuesday 1pm.

    This page is maintained by Jack Shotton; it was shamelessly copied from Brandon Levin's page, which in turn was shamelessly copied from Davide Reduzzi page, which was shamelessly copied from Liang Xiao's page, which was shamelessly copied from Kiran Kedlaya's page, which in turn was shamelessly copied from Jason Starr's page, which in turn was shamelessly copied from Ravi Vakil's page, which in turn was shamelessly copied from Pasha Belorousski's page at the University of Michigan. For more sites with a similar pedigree, see Michael Thaddeus's list or Jim Bryan's list.