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math.CO2006
Counting Descent Pairs with Prescribed Tops and Bottoms
John T. Hall, Jeffrey B. Remmel
Given sets X and Y of positive integers and a permutation sigma = sigma_1, sigma_2, ..., sigma_n in S_n, an X,Y-descent of sigma is a descent pair sigma_i > sigma_{i+1} whose "top"…
math.CO2006
Classifying Descents According to equivalence mod k
Sergey Kitaev, Jeffrey Remmel
In [S. Kitaev and J. Remmel: Classifying descents according to parity] the authors refine the well-known permutation statistic "descent" by fixing parity of (exactly) one of the de…