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Pattern occurrences in k-ary words revisited: A few new and old observations
Journal of Combinatorial Theory Series A ( IF 1.1 ) Pub Date : 2022-01-13 , DOI: 10.1016/j.jcta.2022.105596
Toufik Mansour , Reza Rastegar

In this paper, we study the pattern occurrence in k-ary words. We prove an explicit upper bound on the number of k-ary words avoiding any given pattern using a random walk argument. Additionally, we reproduce one already known result on the exponential rate of growth of pattern occurrence in words and establish a simple connection among pattern occurrences in permutations and k-ary words. A simple yet interesting consequence of this connection is that the Wilf-equivalence of two patterns in words implies their Wilf-equivalence in permutations.



中文翻译:

重新审视 k 元词中的模式出现:一些新旧观察

在本文中,我们研究了k元词中的模式出现。我们使用随机游走参数证明了避免任何给定模式的k元词数量的明确上限。此外,我们重现了一个关于单词中模式出现的指数增长率的已知结果,并在排列中的模式出现和k元单词之间建立了简单的联系。这种联系的一个简单而有趣的结果是,两个模式在单词中的 Wilf 等价意味着它们在排列中的 Wilf 等价。

更新日期:2022-01-14
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