On a question about pattern avoidance of cyclic permutations
Combinatorics
2026-03-09 v1
Abstract
Recently, Archer et al.\ studied cyclic permutations that avoid the decreasing pattern in one-line notation and avoid another pattern of length in all their cycle forms. There are three cases in total to consider, namely, and . They determined two of them, leaving the case as an open question. In this paper, we resolve this case by deriving explicit formulas based on an analysis of the structure of cycle forms and an application of Dilworth's theorem.
Keywords
Cite
@article{arxiv.2603.06269,
title = {On a question about pattern avoidance of cyclic permutations},
author = {Zuo-Ru Zhang and Hongkuan Zhao},
journal= {arXiv preprint arXiv:2603.06269},
year = {2026}
}
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12 pages