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Asymptotic normality in t-stack sortable permutations

Published online by Cambridge University Press:  04 November 2020

Xi Chen
Affiliation:
School of Mathematical Sciences, Dalian University of Technology, Dalian116024, PR China (wangyi@dlut.edu.cn)
Jianxi Mao
Affiliation:
School of Mathematical Sciences, Dalian University of Technology, Dalian116024, PR China (wangyi@dlut.edu.cn)
Yi Wang
Affiliation:
School of Mathematical Sciences, Dalian University of Technology, Dalian116024, PR China (wangyi@dlut.edu.cn)

Abstract

In this paper, we show that the numbers of t-stack sortable n-permutations with k − 1 descents satisfy central and local limit theorems for t = 1, 2, n − 1 and n − 2. This result, in particular, gives an affirmative answer to Shapiro's question about the asymptotic normality of the Narayana numbers.

Type
Research Article
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on Behalf of The Edinburgh Mathematical Society

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