Results 61 to 70 of about 771 (82)

Kaleidoscopic Colorings of Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2017
For an r-regular graph G, let c : E(G) → [k] = {1, 2, . . . , k}, k ≥ 3, be an edge coloring of G, where every vertex of G is incident with at least one edge of each color.
Chartrand Gary, English Sean, Zhang Ping
doaj   +1 more source

On 3-Coloring of ( 2 P 4 , C 5 )-Free Graphs. [PDF]

open access: yesAlgorithmica, 2022
Jelínek V   +4 more
europepmc   +1 more source

𝒫-Apex Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2018
Let 𝒫 be an arbitrary class of graphs that is closed under taking induced subgraphs and let 𝒞 (𝒫) be the family of forbidden subgraphs for 𝒫. We investigate the class 𝒫 (k) consisting of all the graphs G for which the removal of no more than k vertices ...
Borowiecki Mieczysław   +2 more
doaj   +1 more source

Weakly toll convexity and proper interval graphs [PDF]

open access: yesDiscrete Mathematics & Theoretical Computer Science
A walk $u_0u_1 \ldots u_{k-1}u_k$ is a \textit{weakly toll walk} if $u_0u_i \in E(G)$ implies $u_i = u_1$ and $u_ju_k\in E(G)$ implies $u_j=u_{k-1}$. A set $S$ of vertices of $G$ is {\it weakly toll convex} if for any two non-adjacent vertices $x,y \in S$
Mitre C. Dourado   +3 more
doaj   +1 more source

The {−2,−1}-Selfdual and Decomposable Tournaments

open access: yesDiscussiones Mathematicae Graph Theory, 2018
We only consider finite tournaments. The dual of a tournament is obtained by reversing all the arcs. A tournament is selfdual if it is isomorphic to its dual.
Boudabbous Youssef, Ille Pierre
doaj   +1 more source

Developed Zariski Topology-Graph

open access: yesDiscussiones Mathematicae - General Algebra and Applications, 2017
In this paper, we introduce the developed Zariski topology-graph as- sociated to an R-module M with respect to a subset X of the set of all quasi-prime submodules of M and investigate the relationship between the algebraic properties of M and the ...
Hassanzadeh-Lelekaami Dawood   +1 more
doaj   +1 more source

Gromov hyperbolicity of planar graphs

open access: yesOpen Mathematics, 2013
Cantón Alicia   +3 more
doaj   +1 more source

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