Table of Contents
Fall 2026 Meeting Schedule
All meetings take place on Wednesdays, 9:30 - 10:20 am in Burt Hall 204 unless otherwise noted.
| Date | Meeting Title | Speaker | University | Abstract |
|---|---|---|---|---|
| August 26 | Organizational Meeting | |||
| September 2 | Vertex-Minimal Subgraphs with K_n Minors | David Hathaway | Kansas State University | Abstract |
| September 9 | TBA | Jiyoung Choi | Kansas State University | |
| September 16 | TBA | Pietro Poggi-Corradini | Kansas State University | |
| September 23 | TBA | Pietro Poggi-Corradini | Kansas State University | |
| September 30 | Duality for the Dirichlet and Thomson problems on networks | Andrew Jensen | Kansas State University | |
| October 7 | ||||
| October 14 | ||||
| October 21 | ||||
| October 28 | ||||
| November 4 | ||||
| November 11 | ||||
| November 18 | ||||
| November 25 | No Meeting (fall break) | |||
| December 2 | ||||
| December 9 |
Abstracts
September 2
“Vertex-Minimal Subgraphs with K_n Minors”, David Hathaway
Let h(G) be the Hadwiger number of G, the largest n such that G has a K_n minor, and define h_n(G) = min{|V(H)| : H\subset G, h(H)=n}, defined for any n = 1, 2, …, h(G). We seek to study the structure of any given graph through this sequence of orders and its long-term behavior. As a result, the primary focus will be on infinite graphs, in particular those with infinite Hadwiger number. We shall investigate lower bounds originating from basic structural details or from partial knowledge of early elements in the sequence. Along the way, we'll work many examples of interesting finite and infinite graphs.