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  1. Home > Articles & Issues >
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  3. $q,t$-Fuß-Catalan nu ...
Conference paper

$q,t$-Fuß-Catalan numbers for complex reflection groups

Christian Stump (1) (2) (3)
(1) Faculty of Mathematics [Vienna]
(2) Faculty of Mathematics [Univ. Vienna]
(3) Faculty of Mathematics = Fakultät für Mathematik [Vienne, Autriche]
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Imported on
May 10, 2017
Published on
December 31, 2007
Last modified on
March 31, 2025
Volume
DMTCS Proceedings vol. AJ, 20th Annual International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2008)
Proceedings
DOI
10.46298/dmtcs.3639
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https://about.hal.science/hal-authorisation-v1
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$q,t$-Fuß-Catalan numbers for complex reflection groups

Christian Stump (1) (2) (3)
(1) Faculty of Mathematics [Vienna]
(2) Faculty of Mathematics [Univ. Vienna]
(3) Faculty of Mathematics = Fakultät für Mathematik [Vienne, Autriche]
Abstract
English
In type $A$, the $q,t$-Fuß-Catalan numbers $\mathrm{Cat}_n^{(m)}(q,t)$ can be defined as a bigraded Hilbert series of a module associated to the symmetric group $\mathcal{S}_n$. We generalize this construction to (finite) complex reflection groups and exhibit some nice conjectured algebraic and combinatorial properties of these polynomials in $q$ and $t$. Finally, we present an idea how these polynomials could be related to some graded Hilbert series of modules arising in the context of rational Cherednik algebras. This is work in progress.
French
Dans le cas du type $A$, les $q,t$-nombres de Fuß-Catalan $\mathrm{Cat}_n^{(m)}(q,t)$ peuvent être définis comme la série de Hilbert bigraduée d'un certain module associé au groupe symétrique $\mathcal{S}_n$. Nous généralisons cette construction aux groupes de réflexion complexes (finis) et nous formulons de jolies propriétés (conjecturales) algébriques et combinatoires de ces polynômes en $q$ et $t$. Enfin, nous décrivons une idée sur la manière dont ces polynômes pourraient être liés à certaines séries de Hilbert de modules apparaissant dans le contexte des algèbres de Cherednik rationnelles. Ceci est un travail en cours.
Keywords
  • [MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO]
  • [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
  • $q t$-Catalan number
  • reflection group
  • Shi arrangement
  • coinvariant ring
  • rational Cherednik algebras
Cited by

Source: OpenCitations

  • Some Properties and Generalizations of the Catalan, Fuss, and Fuss–Catalan Numbers

    Mathematical Analysis and Applications

    Authors : Feng Qi ORCID, Bai‐Ni Guo ORCID

    Journal reference : Volume , 2018, pp. 101-133

    DOI : 10.1002/9781119414421.ch5
  • q,t-Fuß–Catalan numbers for finite reflection groups

    Journal of Algebraic Combinatorics

    Authors : Christian Stump ORCID

    Journal reference : Volume 32, 2009, pp. 67-97

    DOI : 10.1007/s10801-009-0205-0
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