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Texas A&M University
Mathematics

Events for 08/11/2020 from all calendars

Geometry Seminar

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Time: 10:00AM - 11:00PM

Location: ZooM

Speaker: Tim Seynnaeve, MPI MiS

Title: Flag matroids: algebra and geometry

Abstract: Matroids are one of the central notions in modern combinatorics. They simultaneously generalize the notion of linear independence in a vector space, and the notion of a graph. One of the most important matroid invariants is the Tutte polynomial. In this talk, I will review a geometric interpretation of the Tutte polynomial based on the K-theory of Grassmannians, and introduce a natural generalization to so-called flag matroids. For matroids, the Tutte polynomial is defined combinatorially, and the K-theoretic interpretation is a property. In contrast, for flag matroids, our K-theoretic description serves as a definition for the Tutte polynomial. I will end the talk by discussing some combinatorial properties of this flag-geometric Tutte polynomial. This talk is based on joint work with Rodica Dinu and Chris Eur.