Results 111 to 120 of about 6,554 (178)

Bicyclic graphs with extremal degree resistance distance

open access: yes, 2016
Let $r(u,v)$ be the resistance distance between two vertices $u, v$ of a simple graph $G$, which is the effective resistance between the vertices in the corresponding electrical network constructed from $G$ by replacing each edge of $G$ with a unit resistor. The degree resistance distance of a simple graph $G$ is defined as ${D_R}(G) = \sum\limits_{\{u,
Liu, Jia-Bao   +4 more
openaire   +2 more sources

Extremal unicyclic and bicyclic graphs of the Euler Sombor index

open access: yesAIMS Mathematics
Topological indices are widely used to analyze and predict the physicochemical properties of compounds, and have good application prospects. Recently, the Euler Sombor index was introduced, which is defined as \begin{document}$ \begin{align} EP(G ...
Zhenhua Su, Zikai Tang
doaj   +1 more source

The Laplacian eigenvalue 2 of bicyclic graphs

open access: yes, 2019
If $G$ is a graph, its Laplacian is the difference between diagonal matrix of its vertex degrees and its adjacency matrix. A one-edge connection of two graphs $G_{1}$ and $G_{2}$ is a graph $G=G_{1}\odot G_{2}$ with $V(G)=V(G_{1})\cup V(G_{2})$ and $E(G)= E(G_{1})\cup E(G_{2})\cup \{e=uv\}$ where $u\in V(G_1)$ and $v\in V(G_2)$.
Mojdeh, Doost Ali   +2 more
openaire   +2 more sources

On signless Laplacian coefficients of bicyclic graphs

open access: yes, 2012
22 pages, 3 figures.
Zhang, Jie, Zhang, Xiao-Dong
openaire   +2 more sources

On Some Distance Spectral Characteristics of Trees

open access: yesAxioms
Graham and Pollack in 1971 presented applications of eigenvalues of the distance matrix in addressing problems in data communication systems. Spectral graph theory employs tools from linear algebra to retrieve the properties of a graph from the spectrum ...
Sakander Hayat   +2 more
doaj   +1 more source

MAXIMUM IRREGULARITY OF TOTALLY SEGREGATED ∞-BICYCLIC GRAPHS

open access: yesFar East Journal of Mathematical Sciences (FJMS), 2020
T.F. Jorry, K.S. Parvathy
openaire   +1 more source

On the multiplicative sum Zagreb index of molecular graphs

open access: yesOpen Mathematics
Multiplicative sum Zagreb index is a modified version of the famous Zagreb indices. For a graph GG, the multiplicative sum Zagreb index is defined as Π1*(G)=∏uv∈E(G)(dG(u)+dG(v)){\Pi }_{1}^{* }\left(G)={\prod }_{uv\in E\left(G)}\left({d}_{G}\left(u)+{d}_{
Sun Xiaoling, Du Jianwei, Mei Yinzhen
doaj   +1 more source

Stability of bicyclic guanidine superbases and their salts in water. [PDF]

open access: yesRSC Adv
Gazagnaire E   +6 more
europepmc   +1 more source

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