Results 31 to 40 of about 1,862,441 (301)

Asymptotic properties of some minor-closed classes of graphs (conference version) [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2013
Let $\mathcal{A}$ be a minor-closed class of labelled graphs, and let $G_n$ be a random graph sampled uniformly from the set of n-vertex graphs of $\mathcal{A}$. When $n$ is large, what is the probability that $G_n$ is connected? How many components does
Mireille Bousquet-Mélou, Kerstin Weller
doaj   +1 more source

The Minor Crossing Number of Graphs with an Excluded Minor [PDF]

open access: yesThe Electronic Journal of Combinatorics, 2008
The minor crossing number of a graph $G$ is the minimum crossing number of a graph that contains $G$ as a minor. It is proved that for every graph $H$ there is a constant $c$, such that every graph $G$ with no $H$-minor has minor crossing number at most $c|V(G)|$.
Bokal, Drago   +2 more
openaire   +5 more sources

The probability of planarity of a random graph near the critical point [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science, 2013
Erdős and Rényi conjectured in 1960 that the limiting probability $p$ that a random graph with $n$ vertices and $M=n/2$ edges is planar exists. It has been shown that indeed p exists and is a constant strictly between 0 and 1.
Marc Noy   +2 more
doaj   +1 more source

Stochastic minority on graphs

open access: yesTheoretical Computer Science, 2011
Cellular automata have been mainly studied on very regular graphs carrying the vertices (like lines or grids) and under synchronous dynamics (all vertices update simultaneously). In this paper, we study how the asynchronism and the graph act upon the dynamics of the classical Minority rule.
Rouquier, Jean-Baptiste   +2 more
openaire   +4 more sources

Stem cell therapy for Crohn’s disease: systematic review and meta-analysis of preclinical and clinical studies

open access: yesStem Cell Research & Therapy, 2021
Background We explored whether stem cell therapy was effective for animal models and patients with Crohn’s disease (CD). Methods We searched five online databases. The relative outcomes were analyzed with the aid of GetData Graph Digitizer 2.26 and Stata
Ruo Wang   +7 more
doaj   +1 more source

Ribbon Graph Minors and Low-Genus Partial Duals [PDF]

open access: yes, 2015
We give an excluded minor characterisation of the class of ribbon graphs that admit partial duals of Euler genus at most one.
Iain Moffatt
semanticscholar   +1 more source

Inverse Eigenvalue Problems for Two Special Acyclic Matrices

open access: yesMathematics, 2016
In this paper, we study two inverse eigenvalue problems (IEPs) of constructing two special acyclic matrices. The first problem involves the reconstruction of matrices whose graph is a path, from given information on one eigenvector of the required matrix
Debashish Sharma, Mausumi Sen
doaj   +1 more source

Graph minor hierarchies

open access: yesDiscrete Applied Mathematics, 2005
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Reinhard Diestel, Daniela Kühn
openaire   +2 more sources

Graph Minors and Minimum Degree [PDF]

open access: yesThe Electronic Journal of Combinatorics, 2010
Let $\mathcal{D}_k$ be the class of graphs for which every minor has minimum degree at most $k$. Then $\mathcal{D}_k$ is closed under taking minors. By the Robertson-Seymour graph minor theorem, $\mathcal{D}_k$ is characterised by a finite family of minor-minimal forbidden graphs, which we denote by $\widehat{\mathcal{D}}_k$.
Gasper Fijavz, David R. Wood
openaire   +3 more sources

Characterization of the Existence of an N0-Completion of a Partial N0-Matrix with an Associated Directed Cycle

open access: yesThe Scientific World Journal, 2014
An n×n matrix is called an N0-matrix if all its specified principal minors are nonpositive. In the context of partial matrices, a partial matrix is called a partial N0-matrix if all its specified principal minors are nonpositive.
Cristina Jordán, Juan R. Torregrosa
doaj   +1 more source

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