Classifying Descents According to Parity

Details Classifying Descents According to Parity Classifying Descents According to Parity

2005-08-29

arxiv.org/abs/math/0508570v1

Mathematics

Combinatorics

22 pages

Scientific paper

In this paper we refine the well-known permutation statistic "descent" by fixing parity of (exactly) one of the descent's numbers. We provide explicit formulas for the distribution of these (four) new statistics. We use certain differential operators to obtain the formulas. Moreover, we discuss connection of our new statistics to the Genocchi numbers. We also provide bijective proofs of some of our results.

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