The IPAC (Important Papers in Algebraic Combinatorics) Seminar Homepage


The 2026 IPAC seminar is co-organized by
Jim Haglund of Penn, and Anna Pun of Baruch College,


Link to the 2021 IPAC webpage
Link to the 2022 IPAC webpage
Link to the 2023 IPAC webpage
Link to the 2024 IPAC webpage
Link to the 2025 IPAC webpage

The theme of the seminar is to work through articles/arXiv preprints which represent important current developments, at least initially in algebraic combinatorics. The seminar will meet (via zoom) on Tuesdays and Thursdays from 12-1pm Philadelphia time (unless otherwise noted in the schedule below). Each seminar session will have a "host" who will be responsible for presenting material, but the degree to which the seminar will be a series of lectures or more of a group discussion may vary from week to week. If you wish to attend the talks email me or Anna to get the zoom link (jhaglund "at symbol" math.upenn.edu, annapunying "at symbol" gmail.com). Recordings of the talks will be made if the host is agreeable.

The two papers we will be working through this summer are "Falling stars: a fall-decorated rational shuffle theorem" by Iraci, Pagaria and Paolini, and "A proof of the Fields Conejctures" by Murai, Rhoades and Wilson (both available on the arXiv). The seminar will run from early June to mid August, avoiding FPSAC and the ICM. Schedule forthcoming.