Spring 2024

Seminar on Algebraic Combinatorics
Benjamin Dequêne (University of Picardie Jules Verne)
Organizer: Emily Gunawan, email: emily_gunawan@uml.edu
January 24, 11 a.m. - Noon, Room: Southwick Hall 350W

Abstract: The Robinson-Schensted-Knuth (RSK) correspondence is a bijection from nonnegative integer matrices to pairs of semi-standard Young tableau. A generalized version of RSK gives a bijection from fillings of a tableau of shape lambda to reverse plane partitions of shape lambda.

From the quiver representation point of view, the RSK correspondence provides a transformation between two different invariants of a module X (in a certain subcategory). The entries in the arbitrary filling of shape lambda correspond to multiplicities of indecomposable summands of the representation, while the entries in the reverse plane partition of shape lambda record the generic Jordan form data of X, an invariant introduced by Garver, Patrias and Thomas.

My talk aims to present a version of RSK that works from the most general possible choice of a subcategory of the category of representations of a type A quiver. Note that this talk will not assume that the audience has prior knowledge of quiver representations.

This is a combinatorial extraction (in progress) of my Ph.D. work, supervised by Hugh Thomas.

Seminar: Working on What (WOW)
Daniel Glasscock (UMass Lowell): Difference sets: not Bohring but potentially Bohr
Organizer: Emily Gunawan, email: emily_gunawan@uml.edu
February 21, 11 a.m. - Noon, Room: Southwick Hall 350W

Abstract: It is a basic and often useful fact in analysis that convolutions make things smoother. Less famous is the additive combinatorial analogue: set sums and differences support richer structures (and, hence, are “smoother”). This fact – known almost a century ago – is still being refined and finding new applications in additive number theory today. And there are still many open questions. In this talk, we will discuss the following open question: must the difference set A-A of a syndetic subset of integers A contain a Bohr set?

Seminar: Working on What (WOW)
Amanda Redlich (UMass Lowell)
Organizer: Emily Gunawan, email: emily_gunawan@uml.edu
March 20, 11 a.m. - Noon, Room: Southwick Hall 350W

Seminar on Analysis and Applications
Yuan Liu (Wichita State University)
Organizer: Shiwen Zhang, email: shiwen_zhang@uml.edu
April 1, 11 a.m. - Noon, Room: Southwick Hall 350W

Seminar: Working on What (WOW)
Tibor Beke (UMass Lowell)
Organizer: Emily Gunawan, email: emily_gunawan@uml.edu
April 17, 11 a.m. - Noon, Room: Southwick Hall 350W