English

Combinatoire alg\'ebrique li\'ee aux ordres sur les permutations

Combinatorics 2013-10-08 v1 Discrete Mathematics

Abstract

This thesis comes within the scope of algebraic combinatorics and studies problems related to three orders on permutations: the two said weak orders (right and left) and the strong order or Bruhat order. The first part deals with bases of multivariate polynomials. Most specifically, we study a product of Grothendieck polynomials and prove that it can interpreted as a sum over the Bruhat order. We also present our implementation of Grothendieck polynomials and other bases in Sage. In a second part, we study the Tamari order binary trees. We obtain a new enumeration formula on the Tamari lattice and a new combinatorial prove of Chapoton's functional equation of the generating functions of Tamari intervals. We extend our results to the m-Tamari case and thus retrieve a formula given by Bousquet-M\'elou, Pr\'eville-Ratelle and Fusy.

Keywords

Cite

@article{arxiv.1310.1805,
  title  = {Combinatoire alg\'ebrique li\'ee aux ordres sur les permutations},
  author = {Viviane Pons},
  journal= {arXiv preprint arXiv:1310.1805},
  year   = {2013}
}

Comments

PhD Thesis, 214 pages, 8 chapters, 59 figures

R2 v1 2026-06-22T01:41:44.944Z