KU Combinatorics Seminar
Spring 2025

• The Combinatorics Seminar meets on Fridays, 4-5pm, in Snow 306 (including talks on Zoom). There will be cookies!
• Organizers: Jeremy Martin, Reuven Hodges, and Marge Bayer.
• Good general seminar-attending advice, especially for graduate students: The "Three Things" Exercise for getting things out of talks by Ravi Vakil
• Also consider attending the Graduate Online Combinatorics Colloquium.

Friday 1/24
Organizational meeting

Friday 1/31
Jeremy Martin
Hyperplane Arrangements I

Friday 2/7
Jeremy Martin
Hyperplane Arrangements II

Friday 2/14
Marge Bayer
Polytopes

Friday 2/21
Teerapat Saengsubin
The Lattice Butterfly

Friday 2/28
May Trist
Chromatic MacMahon Functions

Friday 3/7
Han Yin
>i>A Non-Iterative Rule for Straightening Fillings and Orthonormality

Friday 3/14
No seminar (Spring Break)

Friday 3/21
No seminar (Spring Break)

Friday 3/28
Dania Morales (Willamette University)
Matroids and Shellable Simplicial Complexes

Abstract: While any simplicial complex can be assembled one facet at a time, shellable simplicial complexes can be assembled with nice topology at each step. In this talk, we focus on simplicial complexes that arise from a given matroid. After reviewing matroids and related simplicial complexes that are known to be shellable, we define a new simplicial complex. We call our complex the augmented external activity complex and we describe a family of shelling orders. This talk is based on joint work with Andrew Berget.

Friday 4/4
Chris Uchizono
Title TBA (Topic: Dimer models)

Friday 4/11
Tian-Xiao He (Illinois Western University)
Title TBA

Friday 4/18
TBA

Friday 4/25
TBA

Friday 5/2
TBA

Friday 5/9 (Stop Day)
TBA

For seminars from previous semesters, please see the KU Combinatorics Group page.

Last updated Fri 3/7/25