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arXiv 2404.08415math.COcs.DMcs.DS
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松弛$k$叉树的渐近性

Asymptotics of relaxed $k$-ary trees

Manosij Ghosh Dastidar, Michael Wallner

AI总结:

该研究将松弛二叉树的数量渐近结论推广到任意有限元的松弛$k$叉树,证明其数量含拉伸指数项$e^{c n^{1/3}}$,还推导了压缩$k$叉树的递推关系。

摘要:

松弛$k$叉树是具有唯一源点和汇点的有序有向无环图,其中每个节点的出度均为$k$。这类结构产生于树的压缩过程:部分重复子树被提取,重复出现的位置由指针替代。我们证明了当$n\to\infty$时,含$n$个节点的松弛$k$叉树的数量满足$\Theta$阶渐近结果。该结论将此前已证明的二元情形推广到任意有限元数,表明拉伸指数项$e^{c n^{1/3}}$这一罕见现象在所有这类情形中均存在。我们还推导了所有子树均唯一的压缩$k$叉树的递推关系,这类树等价于接受有限字母表上有限语言的最小确定有限自动机(DFA)。

英文摘要:

A relaxed $k$-ary tree is an ordered directed acyclic graph with a unique source and sink in which every node has out-degree $k$. These objects arise in the compression of trees in which some repeated subtrees are factored and repeated appearances are replaced by pointers. We prove an asymptotic theta-result for the number of relaxed $k$-ary tree with $n$ nodes for $n \to \infty$. This generalizes the previously proved binary case to arbitrary finite arity, and shows that the seldom observed phenomenon of a stretched exponential term $e^{c n^{1/3}}$ appears in all these cases. We also derive the recurrences for compacted $k$-ary trees in which all subtrees are unique and minimal deterministic finite automata accepting a finite language over a finite alphabet.

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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