When:
Friday, October 24, 2025
4:00 PM - 5:15 PM CT
Where: Lunt Hall, 105, 2033 Sheridan Road, Evanston, IL 60208 map it
Audience: Faculty/Staff - Student - Public - Post Docs/Docs - Graduate Students
Contact:
Daniel Mallory
DanielMallory2025@u.northwestern.edu
Group: Department of Mathematics: Graduate Student Seminar
Category: Lectures & Meetings
Title: Density versions of Hindman’s sumset theorem
Abstract: In 1973, Hindman proved that for any finite partition of the natural numbers
$C_1 \cup \cdots \cup C_r$, there exists a color $C_i$ containing all finite sums of distinct elements from some infinite set B.
In this talk, we present several density versions of this theorem developed by B. Kra, J. Moreira, F. Richter, and D. Robertson, as well as some new results obtained in joint work with F. Hernández and I. Kousek.
We will also discuss some of the basic dynamical tools used in the proofs.
Note: The talk will start at 4:10 pm