Mathematics – Combinatorics
Scientific paper
2007-10-02
Mathematics
Combinatorics
13 pages
Scientific paper
We prove conjectures of the third author [L. Tevlin, Proc. FPSAC'07, Tianjin]
on two new bases of noncommutative symmetric functions: the transition matrices
from the ribbon basis have nonnegative integral coefficients. This is done by
means of two composition-valued statistics on permutations and packed words,
which generalize the combinatorics of Genocchi numbers.
Hivert Florent
Novelli Jean-Christophe
Tevlin Lenny
Thibon Jean-Yves
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