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arXiv 2201.11773math.PRmath.CO
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随机树的高度为$O(\sqrt{n})$

Random trees have height $O(\sqrt{n})$

Louigi Addario-Berry, Serte Donderwinkel

AI总结:

该研究针对三类随机树推导了高度的非渐近尾界,解决了已有猜想,定义了度序列偏序并证明其诱导树高的随机序,证明基于经典的树-序列双射的断行构造形式。

摘要:

我们得到了具有给定度序列的均匀随机树、简单生成树以及条件Bienaymé树(分支过程的家族树)高度的全新非渐近尾界,在此过程中解决了Janson(2012)提出的三个猜想,并解答了文献中其他若干问题。此外,我们定义了度序列上的一种偏序关系,并证明该偏序会诱导出具有给定度序列的均匀随机树高度的随机序。后一结果还可用于证明,在给定顶点数和叶子数的情况下,次二元随机树是随机意义下最高的树(由此可得,在给定顶点数的同胚不可约随机树中,随机二叉树是随机意义下最高的)。我们的证明部分基于Foata和Fuchs(1970)提出的树与序列之间的双射,正如Addario-Berry、Blanc-Renaudie、Donderwinkel、Maazoun和Martin(2023)所展示的,该双射可被重新表述为一种构造具有给定顶点度的随机树的断行构造法。

英文摘要:

We obtain new non-asymptotic tail bounds for the height of uniformly random trees with a given degree sequence, simply generated trees and conditioned Bienaymé trees (the family trees of branching processes), in the process settling three conjectures of Janson (2012) and answering several other questions from the literature. Moreover, we define a partial ordering on degree sequences and show that it induces a stochastic ordering on the heights of uniformly random trees with given degree sequences. The latter result can also be used to show that sub-binary random trees are stochastically the tallest trees with a given number of vertices and leaves (and thus that random binary trees are the stochastically tallest random homeomorphically irreducible trees with a given number of vertices). Our proofs are based in part on the bijection between trees and sequences introduced by Foata and Fuchs (1970), which can be recast to provide a line-breaking construction of random trees with given vertex degrees as shown in Addario-Berry, Blanc-Renaudie, Donderwinkel, Maazoun and Martin (2023).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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