Signed countings of types B and D permutations and t,q-Euler numbers

Sen Peng Eu, Tung Shan Fu, Hsiang Chun Hsu, Hsin Chieh Liao

研究成果: 雜誌貢獻文章

1 引文 斯高帕斯(Scopus)


It is a classical result that the parity-balance of the number of weak excedances of all permutations (derangements, respectively) of length n is the Euler number En, alternating in sign, if n is odd (even, respectively). Josuat-Vergès obtained a q-analog of the results respecting the number of crossings of a permutation. One of the goals in this paper is to extend the results to the permutations (derangements, respectively) of types B and D, on the basis of the joint distribution in statistics excedances, crossings and the number of negative entries obtained by Corteel, Josuat-Vergès and Kim. Springer numbers are analogous Euler numbers that count the alternating permutations of type B, called snakes. Josuat-Vergès derived bivariate polynomials Qn(t,q) and Rn(t,q) as generalized Euler numbers via successive q-derivatives and multiplications by t on polynomials in t. The other goal in this paper is to give a combinatorial interpretation of Qn(t,q) and Rn(t,q) as the enumerators of the snakes with restrictions.

頁(從 - 到)1-26
期刊Advances in Applied Mathematics
出版狀態已發佈 - 2018 六月

ASJC Scopus subject areas

  • Applied Mathematics

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