Stellahedral geometry of matroids

Christopher Eur, June Huh, Matt Larson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We use the geometry of the stellahedral toric variety to study matroids. We identify the valuative group of matroids with the cohomology ring of the stellahedral toric variety and show that valuative, homological and numerical equivalence relations for matroids coincide. We establish a new log-concavity result for the Tutte polynomial of a matroid, answering a question of Wagner and Shapiro-Smirnov-Vaintrob on Postnikov-Shapiro algebras, and calculate the Chern-Schwartz-MacPherson classes of matroid Schubert cells. The central construction is the 'augmented tautological classes of matroids', modeled after certain toric vector bundles on the stellahedral toric variety.

Original languageEnglish (US)
Article numbere24
JournalForum of Mathematics, Pi
Volume11
DOIs
StatePublished - Oct 9 2023

All Science Journal Classification (ASJC) codes

  • Analysis
  • Algebra and Number Theory
  • Statistics and Probability
  • Mathematical Physics
  • Geometry and Topology
  • Discrete Mathematics and Combinatorics

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