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We study limits of convergent sequences of string graphs, that is, graphs with an intersection representation consisting of curves in the plane. We use these results to study the limiting behavior of a sequence of random string graphs. We…

组合数学 · 数学 2014-03-13 Svante Janson , Andrew J. Uzzell

In the dense graph limit theory, the topology of the set of graphs is defined by the distribution of the subgraphs spanned by finite number of random vertices. Vera T. S\'os proposed a question that if we consider only the number of edges…

组合数学 · 数学 2015-08-21 Endre Csóka

The theory of graphons comes with the so-called cut norm and the derived cut distance. The cut norm is finer than the weak* topology (when considering the predual of $L^{1}$-functions). Dole\v{z}al and Hladk\'y [J. Combin. Theory Ser. B 137…

组合数学 · 数学 2022-04-19 Martin Doležal , Jan Grebík , Jan Hladký , Israel Rocha , Václav Rozhoň

We give a characterization of the effect of sequences of pivot operations on a graph by relating it to determinants of adjacency matrices. This allows us to deduce that two sequences of pivot operations are equivalent iff they contain the…

组合数学 · 数学 2012-11-21 Robert Brijder , Tero Harju , Hendrik Jan Hoogeboom

A mixed graph can be seen as a type of digraph containing some edges (two opposite arcs). Here we introduce the concept of sequence mixed graphs, which is a generalization of both sequence graphs and iterated line digraphs. These structures…

组合数学 · 数学 2016-10-13 C. Dalfó , M. A. Fiol , N. López

The theory of graphons is ultimately connected with the so-called cut norm. In this paper, we approach the cut norm topology via the weak* topology (when considering a predual of $L^{1}$-functions). We prove that a sequence…

组合数学 · 数学 2021-01-05 Martin Doležal , Jan Grebík , Jan Hladký , Israel Rocha , Václav Rozhoň

We find the asymptotic number of connected graphs with $k$ vertices and $k-1+l$ edges when $k,l$ approach infinity, reproving a result of Bender, Canfield and McKay. We use the {\em probabilistic method}, analyzing breadth-first search on…

组合数学 · 数学 2007-05-23 Remco van der Hofstad , Joel Spencer

We address the question of convergence of Schr\"odinger operators on metric graphs with general self-adjoint vertex conditions as lengths of some of graph's edges shrink to zero. We determine the limiting operator and study convergence in a…

谱理论 · 数学 2019-10-23 Gregory Berkolaiko , Yuri Latushkin , Selim Sukhtaiev

We study four different notions of convergence for graphexes, recently introduced by Borgs, Chayes, Cohn and Holden, and by Veitch and Roy. We give some properties of them and some relations between them. We also extend results by Veitch…

概率论 · 数学 2022-03-25 Svante Janson

We consider constrained variants of graph homomorphisms such as embeddings, monomorphisms, full homomorphisms, surjective homomorpshims, and locally constrained homomorphisms. We also introduce a new variation on this theme which derives…

组合数学 · 数学 2014-04-23 Yangjing Long

Distance-regular graphs have many beautiful combinatorial properties. Distance-transitive graphs have very strong symmetries, and they are distance-regular, i.e. distance-transitivity implies distance-regularity. In this paper, we give…

组合数学 · 数学 2018-10-23 Hui Zhou , Cheryl Praeger , Michael Giudici , Rongquan Feng , Xingui Fang

Building on the limit theory for set functions, we prove that the limit of convergent sequence of bounded-degree graphs' cycle matroids can be represented as the cycle matroid of a graphing, analogous to the completeness result for…

组合数学 · 数学 2025-09-23 Yaobin Chen , Zhicheng Liu , Yihang Xiao , Junchi Zhang

This work derives closed-form expressions computing the expectation of co-presence and of number of co-occurrences of nodes on paths sampled from a network according to general path weights (a bag of paths). The underlying idea is that two…

机器学习 · 计算机科学 2021-08-24 Guillaume Guex , Sylvain Courtain , Marco Saerens

In 1985, Golumbic and Scheinerman established an equivalence between comparability graphs and containment graphs, graphs whose vertices represent sets, with edges indicating set containment. A few years earlier, McMorris and Zaslavsky…

组合数学 · 数学 2025-03-31 Ketai Chen , Jared DeLeo , Owen Henderschedt

We introduce a natural definition of $L^p$-convergence of maps, $p \ge 1$, in the case where the domain is a convergent sequence of measured metric space with respect to the measured Gromov-Hausdorff topology and the target is a…

微分几何 · 数学 2007-05-23 Kazuhiro Kuwae , Takashi Shioya

The presented material continues the previous article (arxiv:1007.1059) and also is devoted to the equivalent conversion between the graphs. The examining of the transformation of the vertex graphs into the edge graphs (together with the…

综合数学 · 数学 2012-10-24 Leonid Malinin , Natalia Malinina

Inspired by the notion of action convergence in graph limit theory, we introduce a measure-theoretic representation of matrices, and we use it to define a new notion of pseudo-metric on the space of matrices. Moreover, we show that such…

组合数学 · 数学 2023-01-05 Raffaella Mulas , Giulio Zucal

In \cite{Elek} we proved that the limit of a weakly convergent sequence of finite graphs can be viewed as a graphing or a continuous field of infinite graphs. Thus one can associate a type $II_1$-von Neumann algebra to such graph sequences.…

组合数学 · 数学 2007-05-23 Gábor Elek

We show that every connected graph can be approximated by a normal tree, up to some arbitrarily small error phrased in terms of neighbourhoods around its ends. The existence of such approximate normal trees has consequences of both…

组合数学 · 数学 2021-02-05 Jan Kurkofka , Ruben Melcher , Max Pitz

In estimating the complexity of objects, in particular of graphs, it is common practice to rely on graph- and information-theoretic measures. Here, using integer sequences with properties such as Borel normality, we explain how these…

信息论 · 计算机科学 2017-07-12 Hector Zenil , Narsis Kiani , Jesper Tegnér