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Logistics
Logistics
Seminar meets on Thursdays 10:10-11:00AM CT in Vincent 570
Organizers: Vic Reiner and Anna Weigandt
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Related Seminars
Schedule
Schedule
Click the speaker's name to see the abstract
September 10 - No seminar, 1st week of classes
September 10 - No seminar, 1st week of classes
Title: TBA
Abstract: TBA
September 17 - Vic Reiner (UMN)
September 17 - Vic Reiner (UMN)
Title: Adjacency spectra for once and twice punctured hypercubes
Abstract: The eigenspaces for the adjacency matrices of hypercube graphs are well-understood. After reviewing that story, will explain how to extend it to the graphs obtained by removing a vertex or antipodal pair of vertices. This was motivated by a conjecture on zonotopes arising in the UMN Senior Honors Thesis of Laura Schoenzeit, and whose last remaining proof piece was provided by a query to ChatGPT.
(Based on arxiv:2608.27887, joint with Jang Soo Kim and Laura Schoenzeit.)
September 24 - Anna Weigandt (UMN)
September 24 - Anna Weigandt (UMN)
Title: Symplectic Bumpless Pipe Dreams
Abstract: Bumpless pipe dreams are combinatorial objects in bijection with alternating sign matrices. Double Grothendieck polynomials can be expressed as weighted sums over bumpless pipe dreams, a perspective that has led to many advances in the combinatorics of Schubert calculus and integrable systems. We introduce symplectic bumpless pipe dreams and present an analogous formula for symplectic Grothendieck polynomials, which represent the equivariant $K$–theoretic classes of $\mathrm{Sp}_{2n}$–orbit closures in the flag variety. To prove this result, we construct an analogue of Lascoux’s inflation on these objects, providing a combinatorial realization of the symplectic transition equations that appear in work of the first author, Marberg, and Pawlowski.
This is joint work with Zachary Hamaker.
October 1 - Chau Nguyen (UMN)
October 1 - Chau Nguyen (UMN)
Title: TBA
Abstract: TBA
October 8 - Miranda Moore (UMN)
October 8 - Miranda Moore (UMN)
Title: TBA
Abstract: TBA
October 15 - Rebecca Patrias (Univ. of St. Thomas)
October 15 - Rebecca Patrias (Univ. of St. Thomas)
Title: TBA
Abstract: TBA
October 22 - Carl Mautner (UC Riverside)
October 22 - Carl Mautner (UC Riverside)
Title: TBA
Abstract: TBA
October 29 - Eric Egge (Carleton)
October 29 - Eric Egge (Carleton)
Title: TBA
Abstract: TBA
November 5 - Raymond Chou (UCSD)
November 5 - Raymond Chou (UCSD)
Title: TBA
Abstract: TBA
November 12 - TBA
November 12 - TBA
Title: TBA
Abstract: TBA
November 19 - Marino Romero (MNSU- Mankato)
November 19 - Marino Romero (MNSU- Mankato)
Title: TBA
Abstract: TBA
November 26 - Thanksgiving
November 26 - Thanksgiving
Title: TBA
Abstract: TBA
December 3 - TBA
December 3 - TBA
Title: TBA
Abstract: TBA
December 10 - TBA
December 10 - TBA
Title: TBA
Abstract: TBA
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