Mathematics – Combinatorics
Scientific paper
2009-01-12
Mathematics
Combinatorics
28 pages, 9 figures and 4 tables, final version with several major improvements, to appear in Journal of Algebraic Combinatori
Scientific paper
In type A, the q,t-Fuss-Catalan numbers can be defined as a bigraded Hilbert series of a module associated to the symmetric group. We generalize this construction to (finite) complex reflection groups and, based on computer experiments, we exhibit several conjectured algebraic and combinatorial properties of these polynomials with non-negative integer coefficients. We prove the conjectures for the dihedral groups and for the cyclic groups. Finally, we present several ideas how the q,t-Fuss-Catalan numbers could be related to some graded Hilbert series of modules arising in the context of rational Cherednik algebras and thereby generalize known connections.
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