The IPAC (Important Papers in Algebraic Combinatorics) Seminar Homepage


The 2022 IPAC seminar is co-organized by
Jim Haglund of Penn, and Anna Pun of the University of Virginia and Baruch College,


Link to the 2021 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. 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 first paper we will be working through is "Chromatic Quasisymmetric Functions" by Shareshian and Wachs, available on the arXiv. The seminar will run from the end of classes in the Spring to roughly the end of the summer break, i.e mid May through mid August. See the table below for our schedule for the 2022 Summer Season.

The 2022 IPAC Seminar Schedule

Date                   Host                              Paper                              Lecture Recordings                              Lecture Notes                               Expanded Lecture Notes by Anna                            
5/24 John Shareshian, Washington U Chromatic Quasisymmetric Functions Lecture 1 Lecture 1 Notes Expanded Lecture 1 Notes
5/26 John Shareshian Chromatic Quasisymmetric Functions Lecture 2 Lecture 2 Notes Expanded Lecture 2 Notes
5/31 John Shareshian Chromatic Quasisymmetric Functions Lecture 3 Lecture 3 Notes Expanded Lecture 3 Notes
6/2 John Shareshian Chromatic Quasisymmetric Functions Lecture 4 Lecture 4 Notes
6/7 No Seminar due to the AlCoVE Conference and also the ISM Discovery School: Geometry and Combinatorics of Hessenberg Varieties
6/9 No Seminar due to the ISM Discovery School: Geometry and Combinatorics of Hessenberg Varieties
6/14 Michelle Wachs, U Miami Chromatic Quasisymmetric Functions Lecture 5 Lecture 5 Notes Expanded Lecture 5 Notes
6/16 Michelle Wachs Chromatic Quasisymmetric Functions Lecture 6 Lecture 6 Notes Expanded Lecture 6 Notes
6/21 Michelle Wachs Chromatic Quasisymmetric Functions Lecture 7 Lecture 7 Notes Expanded Lecture 7 Notes
6/23 Michelle Wachs Chromatic Quasisymmetric Functions Lecture 8 Lecture 8 Notes Expanded Lecture 8 Notes
6/28 John Shareshian Chromatic Quasisymmetric Functions (Recent Developments) Lecture 9
6/30 No Seminar - July 4 Holiday Break
7/5 No Seminar - July 4 Holiday Break
7/7 No Seminar - July 4 Holiday Break
7/12 Anna Pun, Baruch College Dens, Nests and the Loehr-Warrington Conjecture Lecture 1 Notes Lectures 1 and 2(in Keynote) Notes Lectures 1 and 2 (in Powerpoint)
7/14 Anna Pun, Baruch College Dens, Nests and the Loehr-Warrington Conjecture Lecture 2
7/19 Anna Pun, Baruch College Dens, Nests and the Loehr-Warrington Conjecture Lecture 3 GL Characters, Dens and Nests, Main Theorem
7/21 Brendon Rhoades, UC San Diego Conjectural connections between Superspace Models and Delta Operators Lecture 1 Lecture 1 Notes
7/26 Brendon Rhoades, UC San Diego Conjectural connections between Superspace Models and Delta Operators Lecture 2 Lecture 2 Notes
7/28 Marino Romero, UPenn Delta and Theta Operator Expansions Lecture 1 Notes
8/2 Marino Romero, UPenn Delta and Theta Operator Expansions Lecture 2 Notes
8/4 Marino Romero, UPenn Delta and Theta Operator Expansions Lecture 3 Notes
8/9 Petter Brändén, KTH Lorentzian Polynomials Lecture 1 Lecture 1 Notes
8/11 Petter Brändén, KTH Lorentzian Polynomials Lecture 2 Lecture 2 Notes
8/16 Petter Brändén, KTH Lorentzian Polynomials
8/18 Petter Brändén, KTH Lorentzian Polynomials
8/23 Petter Brändén, KTH Lorentzian Polynomials