Mathematics – Combinatorics
Scientific paper
2008-06-12
Mathematics
Combinatorics
9 pages, no figures; submitted
Scientific paper
We define the excedence set and the excedance word on $G_{r,n}$, generalizing
a work of Ehrenborg and Steingrimsson and use the inclusion-exclusion principle
to calculate the number of colored permutations having a prescribed excedance
word. We show some symmetric properties as Log concavity and unimodality of a
specific sequence of excedance words.
Bagno Eli
Garber David
Shwartz Robert
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