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The seminar typically meets on Wednesdays at 12:45 in SAS Hall 4201.
We also meet for an outdoor lunch in front of SAS Hall at 12:00 PM beforehand (weather permitting, in the 4th floor common room otherwise). All are welcome!
To join the mailing list, contact Corey Jones at cmjones6@ncsu.edu or any other organizer.
Organizers: Robert Angarone, Yairon Cid-Ruiz, Laura Colmenarejo, David Green, Corey Jones, Andy Manion and Jacob Matherne
Fall 2026
Fall 2026
08/19/2026 Seungkyu Lee (LMO, Université Paris-Saclay and CMLS, École Polytechnique)
Title: Cohomological invariants of matroids and tropical geometry
Abstract: Matroids provide a combinatorial abstraction of linear dependence and, in particular, of hyperplane arrangements. Associated to a hyperplane arrangement is an algebraic variety called the arrangement Schubert variety, introduced by Ardila and Boocher, whose cohomological invariants give rise to invariants in the Kazhdan–Lusztig theory of matroids. For realisable matroids, these invariants admit geometric interpretations and can be studied using Hodge theory, while for arbitrary matroids analogous results have been obtained through algebraically developing combinatorial Hodge theory of matroids. In this talk, I will briefly review this story and introduce tropical matroid Schubert varieties, which extend the geometric picture to arbitrary matroids.
08/26/2026 Robert Angarone (NC State)
Title: Hadamard Products of Jacobi-Trudi Matrices
Abstract: Jacobi-Trudi matrices are noteworthy in symmetric function theory because their determinants are Schur functions. Inspired by a theorem of Wagner, we investigate Hadamard (entry-wise) products of Jacobi-Trudi matrices. In particular, we resolve special cases of a conjecture by Sokal, which states that Hadamard products of Jacobi-Trudi matrices have monomial-positive determinants. In this special case, we also generalize our results to Temperley-Lieb immanants, which are combinatorially-defined generalizations of the determinant. This talk is based on joint work with Jang Soo Kim, Jaeseong Oh, and Daniel Soskin.
09/02/2026 Calvin McPhail-Snyder (Duke U)
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09/09/2026 Anastasia Nathanson (UMN)
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09/16/2026
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09/23/2026
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09/30/2026 Richie Sater (Sigil Intelligence Systems)
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10/07/2026 Ethan Partida (Brown University)
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10/14/2026 Nicholas Proudfoot (U Oregon)
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10/21/2026
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10/28/2026 Louis Esser (NC State)
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11/04/2026 Christine Berkesch (UMN)
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11/11/2026
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11/18/2026
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