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We prove a conjecture of Fox, Huang, and Lee that characterizes directed graphs that have constant density in all tournaments: they are disjoint unions of trees that are each constructed in a certain recursive way.

组合数学 · 数学 2020-06-15 Yufei Zhao , Yunkun Zhou

We survey some recent results on long-standing conjectures regarding Hamilton cycles in directed graphs, oriented graphs and tournaments. We also combine some of these to prove the following approximate result towards Kelly's conjecture on…

组合数学 · 数学 2010-06-04 Daniela Kühn , Deryk Osthus

We prove that almost all digraphs not embedding an independent set of size 3 consist of two disjoint tournaments, and discuss connections with the theory of homogeneous simple structures.

逻辑 · 数学 2015-05-04 Andres Aranda

We investigate the asymptotic structure of a random perfect graph $P_n$ sampled uniformly from the perfect graphs on vertex set $\{1,\ldots,n\}$. Our approach is based on the result of Pr\"omel and Steger that almost all perfect graphs are…

组合数学 · 数学 2017-09-07 Colin McDiarmid , Nikola Yolov

We consider admissible random walks on hyperbolic graphs. For a given harmonic function on such a graph, we prove that asymptotic properties of non-tangential boundedness and non-tangential convergence are almost everywhere equivalent. The…

度量几何 · 数学 2013-03-12 Camille Petit

This paper proves limit theorems for the number of monochromatic edges in uniform random colorings of general random graphs. These can be seen as generalizations of the birthday problem (what is the chance that there are two friends with…

概率论 · 数学 2018-02-13 Bhaswar B. Bhattacharya , Persi Diaconis , Sumit Mukherjee

In this note we study inhomogeneous random bipartite graphs in random environment. These graphs can be thought of as an extension of the classical Erd\"os-R\'enyi random graphs in a random environment. We show that the expected number of…

组合数学 · 数学 2016-11-29 Jairo Bochi , Godofredo Iommi , Mario Ponce

Each finite and connected bipartite graph induces a finite collection of non-isomorphic dessins d'enfants, that is, $2$-cell embeddings of it into some closed orientable surface. We describe an algorithm to compute all these dessins…

组合数学 · 数学 2017-08-24 Ruben A. Hidalgo

A split graph is a graph whose vertices can be partitioned into a clique and a stable set. We investigate the combinatorial species of split graphs, providing species-theoretic generalizations of enumerative results due to B\'ina and…

组合数学 · 数学 2019-07-16 Justin M. Troyka

We deal with a general preferential attachment graph model with multiple type edges. The types are chosen randomly, in a way that depends on the evolution of the graph. In the $N$-type case, we define the (generalized) degree of a given…

概率论 · 数学 2019-03-25 Ágnes Backhausz , Bence Rozner

A paradigm that was successfully applied in the study of both pure and algorithmic problems in graph theory can be colloquially summarized as stating that "any graph is close to being the disjoint union of expanders". Our goal in this paper…

组合数学 · 数学 2015-02-03 Guy Moshkovitz , Asaf Shapira

By utilizing the idea of Colombeau's generalized function, we introduce a notion of asymptotic map between arbitrary diffeological spaces. The category consisting of diffeological spaces and asymptotic maps is enriched over the category of…

代数拓扑 · 数学 2024-04-12 Kazuhisa Shimakawa

Diagonalizability plays an important role in the analysis and design of multivariable systems. A structured matrix is called structurally diagonalizable if almost all of its numerical realizations, obtained by assigning real values to its…

最优化与控制 · 数学 2026-01-30 Yuan Zhang , Yutong Han , Yuanqing Xia , Aming Li

We propose a generalization of the asymptotic equipartition property to discrete sources with an ambiguous alphabet, and prove that it holds for irreducible stationary Markov sources with an arbitrary distinguishability relation. Our…

信息论 · 计算机科学 2022-07-29 Tamás Tasnádi , Péter Vrana

We consider $4$-uniform hypergraphs with the maximum number of hyperedges subject to the condition that every set of $5$ vertices spans either $0$ or exactly $2$ hyperedges and give a construction, using quadratic residues, for an infinite…

组合数学 · 数学 2016-11-08 Karen Gunderson , Jason Semeraro

We establish the conditions under which several algorithmically exploitable structural features hold for random intersection graphs, a natural model for many real-world networks where edges correspond to shared attributes. Specifically, we…

社会与信息网络 · 计算机科学 2017-02-10 Matthew Farrell , Timothy Goodrich , Nathan Lemons , Felix Reidl , Fernando Sánchez Villaamil , Blair D. Sullivan

We study enumeration functions for unimodal sequences of positive integers, where the size of a sequence is the sum of its terms. We survey known results for a number of natural variants of unimodal sequences, including Auluck's generalized…

数论 · 数学 2013-09-02 Kathrin Bringmann , Karl Mahlburg

In this short article we propose a full large $N$ asymptotic expansion of the probability that the $m^{\text{th}}$ power of a random unitary matrix of size $N$ has all its eigenvalues in a given arc-interval centered in $1$ when $N$ is…

概率论 · 数学 2023-07-26 Olivier Marchal

This contribution proposes a new approach towards developing a class of probabilistic methods for classifying attributed graphs. The key concept is random attributed graph, which is defined as an attributed graph whose nodes and edges are…

计算机视觉与模式识别 · 计算机科学 2011-09-23 S. Deepak Srinivasan , Klaus Obermayer

We find new upper bounds on the size of a minimum totally dominating set for random regular graphs and for regular graphs with large girth. These bounds are obtained through the analysis of a local algorithm using a method due to Hoppen and…

组合数学 · 数学 2020-01-07 Carlos Hoppen , Giovane Mansan
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