Results 21 to 30 of about 90,789 (282)

Inverse Clique Domination in Graphs

open access: yesRecoletos Multidisciplinary Research Journal, 2016
Let G be a connected simple graph. A nonempty subset S of the vertex set V (G) is a clique in G if the graph induced by S is complete. A clique S in G is a clique dominating set if it is a dominating set.
Carmelita Loquias   +2 more
doaj   +1 more source

Cliques in rank-1 random graphs: the role of inhomogeneity [PDF]

open access: yes, 2019
We study the asymptotic behavior of the clique number in rank-1 inhomogeneous random graphs, where edge probabilities between vertices are roughly proportional to the product of their vertex weights.
Bogerd, Kay   +2 more
core   +2 more sources

Triangle-free intersection graphs of line segments with large chromatic number [PDF]

open access: yes, 2012
In the 1970s, Erdos asked whether the chromatic number of intersection graphs of line segments in the plane is bounded by a function of their clique number. We show the answer is no.
Arkadiusz Pawlik   +20 more
core   +1 more source

Local and Global Clique Numbers

open access: yesJournal of Combinatorial Theory, Series B, 1994
A graph \(G\) is said to have the \((p,q)\)-property for some integers \(p\geq q\geq 2\) if for every \(p\)-set of its vertices the induced subgraph contains a \(q\)-clique. The aim of the paper is to investigate relations of the type \((p,q)\to (n,s)\), meaning that each graph having the \((p,q)\)- property also has the \((n,s)\)-property.
Linial, N., Rabinovich, Y.
openaire   +2 more sources

Clique descriptor of affine invariant regions for robust wide baseline image matching [PDF]

open access: yes, 2010
Assuming that the image distortion between corresponding regions of a stereo pair of images with wide baseline can be approximated as an affine transformation if the regions are reasonably small, recent image matching algorithms have focused on affine ...
Shin, Dongjoe, Tjahjadi, Tardi
core   +1 more source

Minimum Clique Number, Chromatic Number, and Ramsey Numbers [PDF]

open access: yesThe Electronic Journal of Combinatorics, 2012
Let $Q(n,c)$ denote the minimum clique number over graphs with $n$ vertices and chromatic number $c$. We investigate the asymptotics of $Q(n,c)$ when $n/c$ is held constant. We show that when $n/c$ is an integer $\alpha$, $Q(n,c)$ has the same growth order as the inverse function of the Ramsey number $R(\alpha+1,t)$ (as a function of $t$). Furthermore,
openaire   +2 more sources

Connected Domination Number and a New Invariant in Graphs with Independence Number Three [PDF]

open access: yesComputer Science Journal of Moldova, 2021
Adding a connected dominating set of vertices to a graph $G$ increases its number of Hadwiger $h(G)$. Based on this obvious property in [2] we introduced a new invariant $\eta(G)$ for which $\eta(G)\leq h(G)$. We continue to study its property.
Vladimir Bercov
doaj  

Hard optimization problems have soft edges

open access: yesScientific Reports, 2023
Finding a Maximum Clique is a classic property test from graph theory; find any one of the largest complete subgraphs in an Erdös-Rényi G(N, p) random graph. We use Maximum Clique to explore the structure of the problem as a function of N, the graph size,
Raffaele Marino, Scott Kirkpatrick
doaj   +1 more source

On a class of polynomials associated with the Cliques in a graph and its applications

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1989
The clique polynomial of a graph is defined. An explicit formula is then derived for the clique polynomial of the complete graph. A fundamental theorem and a reduction process is then given for clique polynomials.
E. J. Farrell
doaj   +1 more source

Clique numbers of graphs

open access: yesDiscrete Mathematics, 1986
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Erdös, Paul, Erné, Marcel
openaire   +1 more source

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