Reverse plane partitions of skew staircase shapes and $q$-Euler numbers
Abstract
Recently, Naruse discovered a hook length formula for the number of standard Young tableaux of a skew shape. Morales, Pak and Panova found two -analogs of Naruse's hook length formula over semistandard Young tableaux (SSYTs) and reverse plane partitions (RPPs). As an application of their formula, they expressed certain -Euler numbers, which are generating functions for SSYTs and RPPs of a zigzag border strip, in terms of weighted Dyck paths. They found a determinantal formula for the generating function for SSYTs of a skew staircase shape and proposed two conjectures related to RPPs of the same shape. One conjecture is a determinantal formula for the number of \emph{pleasant diagrams} in terms of Schr\"oder paths and the other conjecture is a determinantal formula for the generating function for RPPs of a skew staircase shape in terms of -Euler numbers. In this paper, we show that the results of Morales, Pak and Panova on the -Euler numbers can be derived from previously known results due to Prodinger by manipulating continued fractions. These -Euler numbers are naturally expressed as generating functions for alternating permutations with certain statistics involving \emph{maj}. It has been proved by Huber and Yee that these -Euler numbers are generating functions for alternating permutations with certain statistics involving \emph{inv}. By modifying Foata's bijection we construct a bijection on alternating permutations which sends the statistics involving \emph{maj} to the statistic involving \emph{inv}. We also prove the aforementioned two conjectures of Morales, Pak and Panova.
Keywords
Cite
@article{arxiv.1711.02337,
title = {Reverse plane partitions of skew staircase shapes and $q$-Euler numbers},
author = {Byung-Hak Hwang and Jang Soo Kim and Meesue Yoo and Sun-mi Yun},
journal= {arXiv preprint arXiv:1711.02337},
year = {2017}
}
Comments
31 pages, 11 figures