Abstract
We consider two combinatorial statistics on permutations. One is the genus. The other, \(\widehat{{\text{des}}}\), is defined for alternating permutations, as the sum of the number of descents in the subwords formed by the peaks and the valleys. We investigate the distribution of \(\widehat{{\text{des}}}\) on genus zero permutations and Baxter permutations. Our q-enumerative results relate the \(\widehat{{\text{des}}}\) statistic to lattice path enumeration, the rank generating function and characteristic polynomial of noncrossing partition lattices, and polytopes obtained as face-figures of the associahedron.
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Dulucq, S., Simion, R. Combinatorial Statistics on Alternating Permutations. Journal of Algebraic Combinatorics 8, 169–191 (1998). https://doi.org/10.1023/A:1008689811936
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DOI: https://doi.org/10.1023/A:1008689811936