Our seminar views algebraic combinatorics broadly, explicitly including algebraic enumeration and related asymptotic and bijective combinatorics, as well as algebraic combinatorics as it appears in pure algebra and in applications outside mathematics.

Our local audience consists principally of combinatorics faculty and grad students. Talks are 50 minutes with questions following. If you are speaking, we need your abstract at least a week in advance so it can make the deadline for our Friday faculty seminar mailing list.

In Winter 2022 we will be starting off strictly online, but hope to transition to a hybrid/in person format depending on the local conditions in Waterloo. Please email an organizer for the Zoom link if you would like to attend.

**Organizers:** Logan Crew and Olya Mandelshtam

We will hold talks on **Thursday afternoons Waterloo time at 1pm** unless otherwise noted.

**Winter 2022**

Date | Speaker | Title |
---|---|---|

Jan 13 | Gabriel Frieden (LaCIM) | Crystal invariant theory and geometric RSK |

Jan 20 | Cesar Cuenca (Harvard) | Weighted set-partitions in random matrix theory |

Jan 27 | Sean Griffin (UC Davis) | TBA |

Feb 3 | Colin Defant (Princeton) | TBA |

Feb 10 | Maciej Dolega (IMPAN) | TBA |

Feb 17 | ||

Feb 24 | Reading week | no seminar |

Mar 3 | Federico Castillo (U. Católica de Chile) | TBA |

Mar 10 | Josh Swanson (USC) | TBA |

Mar 17 | Emmanuel Neye (U. Saskatchewan) | TBA |

Mar 24 | Greta Panova (USC) | TBA |

Mar 31 | Laura Colmenarejo (NCSU) | TBA |

Apr 7 | Farid Aliniaeifard (UBC) | TBA |

Apr 14 | Darij Grinberg (Drexel) | TBA |

**Fall 2021**

Date | Speaker | Title |
---|---|---|

Sept 16 3pm | Carolina Benedetti (U. Andes) | Quotients of lattice path matroids |

Sept 23 | Tianyi Yu (UCSD) | Grothendieck to Lascoux expansions |

Sept 30 | Jon Noel (UVic) | Forcing Quasirandomness in Permutations |

Oct 7 | Shiliang Gao (UIUC) | Newell-Littlewood numbers |

Oct 14 | -- | Reading Week |

Oct 21 | Elaine Wong (RICAM) | Computer Algebra for Tiling Problems |

Oct 28 | Social Event | |

Nov 4 | Torin Greenwood (NDSU) | How many ways can it fold? |

Nov 11 | Jay Pantone (Marquette) | Combinatorial Exploration |

Nov 18 | Philippe Nadeau (Lyon) | Remixed Eulerian numbers |

Nov 25 | Foster Tom (Berkeley) | Horizontal-strip LLT polynomials |

Dec 2 | Mercedes Rosas (U. Sevilla) | |

Dec 9 | Steven Santoli (Waterloo) |

**Spring 2021**

Date | Speaker | Title |
---|---|---|

May 13 | Christian Bean (Reykjavik) | Automating the enumeration of pattern-avoiding permutations |

May 20 | Steven Karp (UQAM) | q-Whittaker functions, finite fields, and Jordan forms |

May 27 | -- | CanaDAM, no seminar |

June 3 | Oliver Pechenik (Waterloo) | What is the degree of a Grothendieck polynomial? |

June 10 | Lukas Nabergall (Waterloo) | Enumerating hereditary classes of chord diagrams |

June 17 | Angèle Hamel (Wilfrid Laurier) | Identities for ninth variation Schur Q-functions |

June 24 | Terrence George (Michigan) | Arctic curves for groves |

July 1 | -- | Canada Day, no seminar |

July 8 | -- | FPSAC, no seminar |

July 15 | David Wagner (Waterloo) | Subgraph counting polynomials: some old results and new ideas |

July 22 | Nadia Lafrenière (Dartmouth) | The spectrum of the random-to-below Markov chain |

July 29 | Social Week | |

August 5 | Simone Hu (Waterloo) | A tale of two integrals |

August 12 | URA showcase |

**Winter 2021**

Date | Speaker | Title |
---|---|---|

January 14 | Steve Melczer | Analytic combinatorics, rigorous numerics, and uniqueness of biomembranes |

January 21 | Jason Bell | The growth of groups and algebras |

January 28 | Olya Mandelshtam | The multispecies TAZRP and modified Macdonald polynomials |

February 4 | Jessica Striker | Promotion and rowmotion: an ocean of notions |

February 11 | Julien Courtiel | Solving Prellberg and Mortimer's conjecture - bijection(s) between Motzkin paths and triangular walks |

February 18 | -- | Reading week, no seminar |

February 25 | Nick Loehr | Chain decompositions for q,t-Catalan numbers |

March 4 | Ralph Kaufmann | Graphs and combinatorics with a relationship to algebra, geometry and physics |

March 11 | Karen Yeats | Equivalences of Wilson loop diagrams |

March 18 | David Wagner | The Poset Conjecture: results, counterexamples, and open problems |

March 25 | Colleen Robichaux | An Efficient Algorithm for Deciding the Vanishing of Schubert Polynomial Coefficients |

April 1 | Amy Wiebe | A combinatorial approach to Minkowski tensors of polytopes |

April 8 | Jonathan Novak | A Tale of Two Integrals |

April 15 | Yannic Vargas | Algebraic structure of the Hopf algebra of double posets |