Francesco Brenti ; Fabrizio Caselli
-
Peak algebras, paths in the Bruhat graph and Kazhdan-Lusztig polynomials
dmtcs:2423 -
Discrete Mathematics & Theoretical Computer Science,
January 1, 2014,
DMTCS Proceedings vol. AT, 26th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2014)
-
https://doi.org/10.46298/dmtcs.2423Peak algebras, paths in the Bruhat graph and Kazhdan-Lusztig polynomialsConference paperAuthors: Francesco Brenti
1,2,3; Fabrizio Caselli
4,5
0000-0003-0627-9906##NULL
Francesco Brenti;Fabrizio Caselli
[en]
We obtain a nonrecursive combinatorial formula for the Kazhdan-Lusztig polynomials which holds in complete generality and which is simpler and more explicit than any existing one, and which cannot be linearly simplified. Our proof uses a new basis of the peak subalgebra of the algebra of quasisymmetric functions.
[fr]
On montre une formule combinatoire pour les polynômes de Kazhdan-Lusztig qui est valable en toute généralité. Cette formule est plus simple et plus explicite que toutes les autres formules connues; de plus, elle ne peut pas être simplifiée linéairement. La preuve utilise une nouvelle base pour la sous-algèbre des sommets de l’algèbre des fonctions quasi-symmetriques.
Volume: DMTCS Proceedings vol. AT, 26th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2014)
Section: Proceedings
Published on: January 1, 2014
Imported on: November 21, 2016
Keywords: [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], [en] quasi-symmetric functions, cd-index, Coxeter groups, lattice paths