Anouk Bergeron-Brlek - Invariants in Non-Commutative Variables of the Symmetric and Hyperoctahedral Groups

dmtcs:3609 - Discrete Mathematics & Theoretical Computer Science, January 1, 2008, DMTCS Proceedings vol. AJ, 20th Annual International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2008) - https://doi.org/10.46298/dmtcs.3609
Invariants in Non-Commutative Variables of the Symmetric and Hyperoctahedral GroupsConference paper

Authors: Anouk Bergeron-Brlek 1

  • 1 Department of Mathematics and Statistics [Toronto]

[en]
We consider the graded Hopf algebra $NCSym$ of symmetric functions with non-commutative variables, which is analogous to the algebra $Sym$ of the ordinary symmetric functions in commutative variables. We give formulaes for the product and coproduct on some of the analogues of the $Sym$ bases and expressions for a shuffle product on $NCSym$. We also consider the invariants of the hyperoctahedral group in the non-commutative case and a state a few results.

[fr]
Nous considérons l'algèbre de Hopf graduée $NCSym$ des fonctions symétriques en variables non-commutatives, qui est analogue à l'algèbre $Sym$ des fonctions symétriques en variables commutatives. Nous donnons des formules pour le produit et coproduit sur certaines des bases analogues à celles de $Sym$, ainsi qu'une expression pour le produit $\textit{shuffle}$ sur $NCSym$. Nous considérons aussi les invariants du groupe hyperoctaédral dans le cas non-commutatif et énonçons quelques résultats.


Volume: DMTCS Proceedings vol. AJ, 20th Annual International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2008)
Section: Proceedings
Published on: January 1, 2008
Imported on: May 10, 2017
Keywords: [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], [en] invariants, symmetric function, non-commutative variables, Hopf algebra

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