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Peer-reviewedCC BY 4.0Algebraic Combinatorics

On chain polynomials of geometric lattices

  1. 1KTH Royal Institute of Technology, Department of Mathematics, SE-100 44 Stockholm (Sweden)

Abstract

Athanasiadis and Kalampogia-Evangelinou recently conjectured that the chain polynomial of any geometric lattice has only real zeros. We verify this conjecture for families of geometric lattices including perfect matroid designs, Dowling lattices, and for a class of geometric lattices that contains all lattices of flats of paving matroids.

We also investigate how the conjecture behaves with respect to certain operations such as direct products, ordinal sums and single-element extensions.

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BibTeX
@article{branden2026chain,
  title = {{On chain polynomials of geometric lattices}},
  author = {Petter Brändén and Leonardo Saud Maia Leite},
  journal = {Algebraic Combinatorics},
  year = {2026},
  month = oct,
  doi = {10.5802/alco.513},
  url = {https://alco.centre-mersenne.org/articles/10.5802/alco.513/},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - On chain polynomials of geometric lattices
AU  - Petter Brändén
AU  - Leonardo Saud Maia Leite
PY  - 2026
DA  - 2026/10/27
JO  - Algebraic Combinatorics
DO  - 10.5802/alco.513
UR  - https://alco.centre-mersenne.org/articles/10.5802/alco.513/
AB  - Athanasiadis and Kalampogia-Evangelinou recently conjectured that the chain polynomial of any geometric lattice has only real zeros. We verify this conjecture for families of geometric lattices including perfect matroid designs, Dowling lattices, and for a class of geometric lattices that contains all lattices of flats of paving matroids.  We also investigate how the conjecture behaves with respect to certain operations such as direct products, ordinal sums and single-element extensions.
SN  - 2589-5486
ER  -