Restricted stacks as functions
Restricted stacks as functions
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限制堆栈作为函数
DOI:
10.1016/j.disc.2021.112571
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发表时间:
2022
影响因子:
0.8
通讯作者:
Berlow, Katalin
中科院分区:
文献类型:
--
作者:
Berlow, Katalin
The stack sort algorithm has been the subject of extensive study over the years. In this paper we explore a generalized version of this algorithm where instead of avoiding a single decrease, the stack avoids a set T of permutations. We let s T denote this map. We classify for which sets T the map s T is bijective. A corollary to this answers a question of Baril, Cerbai, Khalil, and Vajnovszki about stack sort composed with s {σ, τ}, known as the (σ, τ)-machine. This fully classifies for which σ and τ the preimage of the identity under the (σ, τ)-machine is counted by the Catalan numbers. We also prove that the number of preimages of a permutation under the map s T is bounded by the Catalan numbers, with a shift of indices. For T of size 1, we classify exactly when this bound is sharp. We also explore the periodic points and maximum number of preimages of various s T for T containing two length 3 permutations.
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影响因子:
0.8
作者:
M. Bousquet
通讯作者:
M. Bousquet
DOI:
--
发表时间:
2012
期刊:
arXiv.org
影响因子:
--
作者:
Anders Claesson;Henning Úlfarsson
通讯作者:
Henning Úlfarsson
DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
Giulio Cerbai
通讯作者:
Giulio Cerbai
影响因子:
1.7
作者:
Colin Defant
通讯作者:
Colin Defant
DOI:
--
发表时间:
2020
期刊:
European journal of combinatorics (Print)
影响因子:
--
作者:
Colin Defant
通讯作者:
Colin Defant