Mathematics – Combinatorics
Scientific paper
2010-07-07
Mathematics
Combinatorics
14 pages, minor changes, new references added
Scientific paper
We consider a bivariate polynomial that generalizes both the length and reflection length generating functions in a finite Coxeter group. In seeking a combinatorial description of the coefficients, we are led to the study of a new Mahonian statistic, which we call the sorting index. The sorting index of a permutation and its type B and type D analogues have natural combinatorial descriptions which we describe in detail.
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