English

Equivariant Tutte Polynomial

Algebraic Geometry 2025-09-25 v3 Combinatorics

Abstract

We use the equivariant cohomology ring of the permutohedral variety to study matroids and their invariants. Investigating the pushforward of matroid Chern classes defined by A. Berget, C. Eur, H. Spink and D. Tseng to the product space Pn×Pn\mathbb{P}^n \times \mathbb{P}^n, we establish an equivariant generalization of the Tutte polynomial of a matroid. This was suggested in a survey paper by M.Micha{\l}ek. We discuss how this polynomial encodes properties of the matroid by looking at special evaluations. We further introduce an equivariant generalization of the reduced characteristic polynomial of a matroid.

Keywords

Cite

@article{arxiv.2312.00913,
  title  = {Equivariant Tutte Polynomial},
  author = {Mario Bauer and Matěj Doležálek and Magdaléna Mišinová and Semen Słobodianiuk and Julian Weigert},
  journal= {arXiv preprint arXiv:2312.00913},
  year   = {2025}
}

Comments

31 pages, 2 tables, accepted for publication in Discrete & Computational Geometry

R2 v1 2026-06-28T13:38:51.734Z