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arXiv 0907.0376math.CO
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具有给定3-连通分支的图类:渐近图enumeration和随机图

Graph classes with given 3-connected components: asymptotic enumeration and random graphs

Omer Gimenez, Marc Noy, Juanjo Rue

摘要:

考虑一类中等增长的3-连通图$\mathcal{T}$,设$\mathcal{G}$是其3-连通分支是$\mathcal{T}$中的图的图类。我们提出了一个通用的框架,用于分析这种图形类的生成函数的奇异性分析的基础上,概括了以前研究的情况下,如可平面图和串并联图。基于与$\mathcal{T}$相关的指数母函数的奇异性,我们给出了$\mathcal{G}$中图的渐近数的一般结果。我们得到的极限定律,这是正常的或泊松,几个基本参数,包括边缘的数量,块的数量和组件的数量。对于最大块的大小,我们发现一个基本的二分法:类类似于可平面图几乎肯定有一个唯一的线性大小的块,而类类似于串并联图只有次线性块。这种二分法也适用于最大的3连通分支的大小。对于一些类的研究,这两个政权发生,因为一个关键的现象,在类中的边缘密度变化。

英文摘要:

Consider a family $\mathcal{T}$ of 3-connected graphs of moderate growth, and let $\mathcal{G}$ be the class of graphs whose 3-connected components are graphs in $\mathcal{T}$. We present a general framework for analyzing such graphs classes based on singularity analysis of generating functions, which generalizes previously studied cases such as planar graphs and series-parallel graphs. We provide a general result for the asymptotic number of graphs in $\mathcal{G}$, based on the singularities of the exponential generating function associated to $\mathcal{T}$. We derive limit laws, which are either normal or Poisson, for several basic parameters, including the number of edges, number of blocks and number of components. For the size of the largest block we find a fundamental dichotomy: classes similar to planar graphs have almost surely a unique block of linear size, while classes similar to series-parallel graphs have only sublinear blocks. This dichotomy also applies to the size of the largest 3-connected component. For some classes under study both regimes occur, because of a critical phenomenon as the edge density in the class varies.

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