Results 91 to 100 of about 2,530 (150)

Several Zagreb indices of power graphs of finite non-abelian groups. [PDF]

open access: yesHeliyon, 2023
Ismail R   +5 more
europepmc   +1 more source

Structures of W(2.2) Lie conformal algebra

open access: yesOpen Mathematics, 2016
The purpose of this paper is to study W(2, 2) Lie conformal algebra, which has a free ℂ[∂]-basis {L, M} such that [LλL]=(∂+2λ)L,[LλM]=(∂+2λ)M,[MλM]=0$\begin{equation}[{L_\lambda }L] = (\partial + 2\lambda )L,[{L_\lambda }M] = (\partial + 2\lambda )M,[{M_\
Yuan Lamei, Wu Henan
doaj   +1 more source

Spectral Bayesian network theory. [PDF]

open access: yesLinear Algebra Appl, 2023
Duttweiler L, Thurston SW, Almudevar A.
europepmc   +1 more source

On the spectral radius and energy of the degree distance matrix of a connected graph

open access: yesOpen Mathematics
Let GG be a simple connected graph on nn vertices. The degree of a vertex v∈V(G)v\in V\left(G), denoted by dv{d}_{v}, is the number of edges incident with vv and the distance between any two vertices u,v∈V(G)u,v\in V\left(G), denoted by duv{d}_{uv}, is ...
Khan Zia Ullah, Hameed Abdul
doaj   +1 more source

A Laplacian eigenbasis for threshold graphs

open access: yesSpecial Matrices
Let GG be a graph on nn vertices. In this article, we prove that an eigenbasis of the Laplacian matrix of a star graph of order nn is also an eigenbasis of GG if and only if GG is a threshold graph. As an application of this spectral characterization, we
Macharete Rafael R.   +3 more
doaj   +1 more source

Note on the product of the largest and the smallest eigenvalue of a graph

open access: yesSpecial Matrices
In this note, we use eigenvalue interlacing to derive an inequality between a graph’s maximum degree and its maximum and minimum adjacency eigenvalues. The equality case is fully characterized.
Abiad Aida   +2 more
doaj   +1 more source

On the minimum spectral radius of connected graphs of given order and size

open access: yesSpecial Matrices
In this article, we study a question of Hong from 1993 related to the minimum spectral radii of the adjacency matrices of connected graphs of given order and size.
Cioaba Sebastian M.   +2 more
doaj   +1 more source

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