Results 41 to 50 of about 1,844,339 (310)

Walk entropies on graphs [PDF]

open access: yes, 2014
Entropies based on walks on graphs and on their line-graphs are defined. They are based on the summation over diagonal and off-diagonal elements of the thermal Green’s function of a graph also known as the communicability. The walk entropies are strongly
de la Peña, José A.   +2 more
core   +1 more source

Characterization of Line-Consistent Signed Graphs

open access: yesDiscussiones Mathematicae Graph Theory, 2015
The line graph of a graph with signed edges carries vertex signs. A vertex-signed graph is consistent if every circle (cycle, circuit) has positive vertex-sign product. Acharya, Acharya, and Sinha recently characterized line-consistent signed graphs, i.e.
Slilaty Daniel C., Zaslavsky Thomas
doaj   +1 more source

Graphs isomorphic to subgraphs of their line-graphs

open access: yesDiscrete Mathematics, 1982
AbstractAn embedding of graph G into graph H is by defenition an isomorphism of G onto a subgraph of H. It is shown in this paper that every unicycle U embeds in its line-graph L(U), and that every other connected graph that embeds in its own line-graph may be constructed from such an embedded unicycle in a natural way.
Ralph Tindell, Douglas Bauer
openaire   +3 more sources

Graph equations for line graphs and total graphs

open access: yesDiscrete Mathematics, 1975
AbstractAll pairs (G,H) of graphs G,H satisfying L(G) = T(H) are determined. The “graph equation“ L(G)= T(H) is also solved.
Slobodan K. Simi, Dragos M. Cvetkovi
openaire   +1 more source

Some Properties of Regular Line Graphs

open access: yesمجلة علوم ذي قار, 2019
In this paper, the concept of regular line graph has been introduced. The maximum number of vertices with different degrees in the regular line graphs has also been studied.
Akram Attar
doaj   +4 more sources

Drawing Arrangement Graphs In Small Grids, Or How To Play Planarity [PDF]

open access: yes, 2013
We describe a linear-time algorithm that finds a planar drawing of every graph of a simple line or pseudoline arrangement within a grid of area O(n^{7/6}). No known input causes our algorithm to use area \Omega(n^{1+\epsilon}) for any \epsilon>0; finding
D. Dolev   +18 more
core   +3 more sources

On the line-connectivity of line-graphs

open access: yesMathematische Annalen, 1970
Throughout the paper, G will denote a finite undirected graph without loops or multiple lines. The line-graph L(G) of G is that graph whose point set can be put in one-to-one correspondence with the line set of G, such that two points of L(G) are adjacent if and only if the corresponding lines of G are adjacent.
openaire   +2 more sources

On Hamilton Decompositions of Line Graphs of Non-Hamiltonian Graphs and Graphs without Separating Transitions [PDF]

open access: yes, 2017
In contrast with Kotzig's result that the line graph of a $3$-regular graph $X$ is Hamilton decomposable if and only if $X$ is Hamiltonian, we show that for each integer $k\geq 4$ there exists a simple non-Hamiltonian $k$-regular graph whose line graph ...
Bryant, Darryn   +2 more
core   +1 more source

On two energy-like invariants of line graphs and related graph operations

open access: yesJournal of Inequalities and Applications, 2016
For a simple graph G of order n, let μ 1 ≥ μ 2 ≥ ⋯ ≥ μ n = 0 $\mu_{1}\geq\mu_{2}\geq\cdots\geq\mu_{n}=0$ be its Laplacian eigenvalues, and let q 1 ≥ q 2 ≥ ⋯ ≥ q n ≥ 0 $q_{1}\geq q_{2}\geq\cdots\geq q_{n}\geq0$ be its signless Laplacian eigenvalues.
Xiaodan Chen, Yaoping Hou, Jingjian Li
doaj   +1 more source

FoxO1 signaling in B cell malignancies and its therapeutic targeting

open access: yesFEBS Letters, EarlyView.
FoxO1 has context‐specific tumor suppressor or oncogenic character in myeloid and B cell malignancies. This includes tumor‐promoting properties such as stemness maintenance and DNA damage tolerance in acute leukemias, or regulation of cell proliferation and survival, or migration in mature B cell malignancies.
Krystof Hlavac   +3 more
wiley   +1 more source

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