Results 1 to 10 of about 703,543 (312)

On hamiltonian line-graphs [PDF]

open access: bronzeTransactions of the American Mathematical Society, 1968
Introduction. The line-graph L(G) of a nonempty graph G is the graph whose point set can be put in one-to-one correspondence with the line set of G in such a way that two points of L(G) are adjacent if and only if the corresponding lines of G are adjacent.
Gary Chartrand
openalex   +3 more sources

Graphs whose line graphs are ring graphs [PDF]

open access: yesAKCE International Journal of Graphs and Combinatorics, 2020
Given a graph H, a path of length at least two is called an H-path if meets H exactly in its ends. A graph G is a ring graph if each block of G which is not a bridge or a vertex can be constructed inductively by starting from a single cycle and then in ...
Mahdi Reza Khorsandi
doaj   +3 more sources

Every $3$-connected, essentially $11$-connected line graph is hamiltonian [PDF]

open access: bronzeDiscrete Mathematics & Theoretical Computer Science, 2005
Thomassen conjectured that every $4$-connected line graph is hamiltonian. A vertex cut $X$ of $G$ is essential if $G-X$ has at least two nontrivial components. We prove that every $3$-connected, essentially $11$-connected line graph is hamiltonian. Using
Hong-Jian Lai   +3 more
doaj   +3 more sources

Clique-transversal sets of line graphs and complements of line graphs

open access: bronzeDiscrete Mathematics, 1991
AbstractA clique-transversal set T of a graph G is a set of vertices of G such that T meets all maximal cliques of G. The clique-transversal number, denoted τc(G), is the minimum cardinality of a clique-transversal set. Let n be the number of vertices of G. We study classes of graphs G for which n2 is an upper bound for τc(G).
Thomas Andreae   +2 more
openalex   +3 more sources

On Bivariegated Graphs and Line Graphs [PDF]

open access: yesarXiv, 2018
This note is on the structures of line graphs and 2-variegated graphs. We have given here solutions of some graph equations involving line graphs and 2-variegated graphs. In addition, a characterization of potentially 2-variegated line graphic degree sequences is given.
arxiv   +3 more sources

On pancyclic line graphs [PDF]

open access: bronzeCzechoslovak Mathematical Journal, 1978
Ladislav Nebeský
openalex   +3 more sources

New results and open problems in line graphs

open access: yesAKCE International Journal of Graphs and Combinatorics, 2022
Given a graph G with at least one edge, the line graph L(G) is that graph whose vertices are the edges of G, with two of these vertices being adjacent if the corresponding edges are adjacent in G.
Jay Bagga, Lowell Beineke
doaj   +1 more source

Graph schema and best graph type to compare discrete groups: Bar, line, and pie

open access: yesFrontiers in Psychology, 2022
Different graph types may differ in their suitability to support group comparisons, due to the underlying graph schemas. This study examined whether graph schemas are based on perceptual features (i.e., each graph type, e.g., bar or line graph, has its ...
Fang Zhao, Robert Gaschler
doaj   +1 more source

Line graph characterization of power graphs of finite nilpotent groups [PDF]

open access: yesCommunications in Algebra, 2022, 2021
This paper deals with the classification of groups $G$ such that power graphs and proper power graphs of $G$ are line graphs. In fact, we classify all finite nilpotent groups whose power graphs are line graphs. Also, we categorize all finite nilpotent groups (except non-abelian $2$-groups) whose proper power graphs are line graphs.
arxiv   +1 more source

Home - About - Disclaimer - Privacy