arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2110.00522math.PR
收藏

带有限随机权重的加权递归图中高阶顶点的位置

The location of high-degree vertices in weighted recursive graphs with bounded random weights

Bas Lodewijks

AI总结:

该研究探讨了加权递归图中高阶顶点位置的渐近行为,证明了最大度数顶点标签大小的临界指数,并扩展了相关模型的渐近理论。

摘要:

我们研究了当权重是独立同分布且几乎必然有界的随机变量时,加权递归图(WRG)中高阶顶点标签大小的渐近增长速率,并由此验证了Lodewijks和Ortgiese的猜想。WRG是随机递归树(RRT)和有向无环图模型(DAG)的推广,在其中顶点被分配顶点权重,新顶点连接到m∈N个前驱顶点,每个前驱被独立选择的概率与前驱顶点的权重成正比。先前工作已经确定了WRG模型中最大度数的渐近增长速率,而我们在此证明存在一个临界指数μ_m,使得最大度数顶点的典型标签大小等于n^{μ_m(1+o(1))}几乎必然地随着图的大小n趋于无穷。这些结果扩展并改进了最大度数位置的渐近行为,以前只在RRT模型中已知,现在扩展到更一般的加权多图情况的WRG模型。此外,对于加权递归树(WRT)模型,即WRG模型中m=1的情况,我们证明在对顶点权重分布附加假设的情况下,高阶顶点的缩放度数和标签的联合收敛性,并且还扩展了Eslava、Lodewijks和Ortgiese获得的最大度数增长速率的结果。

英文摘要:

We study the asymptotic growth rate of the label size of high-degree vertices in weighted recursive graphs (WRG) when the weights are i.i.d. almost surely bounded random variables, and as a result confirm a conjecture by Lodewijks and Ortgiese. WRGs are a generalisation of the random recursive tree (RRT) and directed acyclic graph model (DAG), in which vertices are assigned vertex-weights and where new vertices attach to $m\in\mathbb N$ predecessors, each selected independently with a probability proportional to the vertex-weight of the predecessor. Prior work established the asymptotic growth rate of the maximum degree of the WRG model and here we show that there exists a critical exponent $μ_m$, such that the typical label size of the maximum degree vertex equals $n^{μ_m(1+o(1))}$ almost surely as $n$, the size of the graph, tends to infinity. These results extend and improve on the asymptotic behaviour of the location of the maximum degree, formerly only known for the RRT model, to the more general weighted multigraph case of the WRG model. Moreover, for the Weighted Recursive Tree (WRT) model, that is, the WRG model with $m=1$, we prove the joint convergence of the rescaled degree and label of high-degree vertices under additional assumptions on the vertex-weight distribution, and also extend results on the growth rate of the maximum degree obtained by Eslava, Lodewijks, and Ortgiese.

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。

↑