Journal of Linear and Topological Algebra (JLTA)Journal of Linear and Topological Algebra (JLTA)
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Feed provided by Journal of Linear and Topological Algebra (JLTA). Click to visit.Normalized laplacian spectrum of two new types of join graphs
http://jlta.iauctb.ac.ir/article_530214_113858.html
‎Let $G$ be a graph without an isolated vertex‎, ‎the normalized Laplacian matrix $tilde{mathcal{L}}(G)$‎‎is defined as $tilde{mathcal{L}}(G)=mathcal{D}^{-frac{1}{2}}mathcal{L}(G) mathcal{D}^{-frac{1}{2}}$‎, where ‎$‎mathcal{‎D}‎$ ‎is a‎ diagonal matrix whose entries are degree of ‎vertices ‎‎of ‎$‎G‎$‎‎. ‎The eigenvalues of‎‎$tilde{mathcal{L}}(G)$ are ‎called ‎ ‎ as ‎the ‎normalized Laplacian eigenvalues of $G$‎. ‎In this paper‎, ‎we obtain the normalized Laplacian spectrum of two new types of join graphs‎. ‎In continuing‎, ‎we determine the integrality of normalized Laplacian eigenvalues of graphs‎. ‎Finally‎, ‎the normalized Laplacian energy and degree Kirchhoff index of these new graph ‎products‎ are derived‎.Tue, 28 Feb 2017 20:30:00 +0100The method of radial basis functions for the solution of nonlinear Fredholm integral equations ...
http://jlta.iauctb.ac.ir/article_530220_113858.html
In this paper, An effective and simple numerical method is proposed for solving systems of integral equations using radial basis functions (RBFs). We present an algorithm based on interpolation by radial basis functions including multiquadratics (MQs), using Legendre-Gauss-Lobatto nodes and weights. Also a theorem is proved for convergence of the algorithm. Some numerical examples are presented and results are compared to the analytical solution and Triangular functions (TF), Delta basis functions (DFs), block-pulse functions , sinc fucntions, Adomian decomposition, computational, Haar wavelet and direct methods to demonstrate the validity and applicability of the proposed method.Tue, 28 Feb 2017 20:30:00 +0100Unique common coupled fixed point theorem for four maps in $S_b$- metric spaces
http://jlta.iauctb.ac.ir/article_530217_113858.html
In this paper we prove a unique common coupled fixed point theorem for two pairs of $w$-compatible mappings in $S_b$-metric spaces satisfying a contrctive type condition. We furnish an example to support our main theorem. We also give a corollary for Junck type maps.Tue, 28 Feb 2017 20:30:00 +0100Coupled fixed point theorems involving contractive condition of integral type in generalized ...
http://jlta.iauctb.ac.ir/article_530218_113858.html
In this manuscript, we prove some coupled fixed point theoremsfor two pairs of self mappings satisfying contractive conditions of integraltype in generalized metric spaces. We furnish suitable illustrative examples.In this manuscript, we prove some coupled fixed point theoremsfor two pairs of self mappings satisfying contractive conditions of integraltype in generalized metric spaces. We furnish suitable illustrative examples.Tue, 28 Feb 2017 20:30:00 +0100Characterization of δ-double derivations on rings and algebras
http://jlta.iauctb.ac.ir/article_530219_113858.html
The main purpose of this article is to prove the following result;Let 𝑛>1 be an integer, 𝑅 be a unital 𝑛!-torsion free semiprime ring and 𝑑,𝛿:𝑅→𝑅 be two additive mappings satisfying 𝑑(𝑥𝑛)=Σ𝑥𝑛−𝑗𝑑(𝑥)𝑥𝑗−1+ΣΣ𝑥𝑘𝛿(𝑥)𝑥𝑖𝛿(𝑥)𝑥𝑛−2−𝑘−𝑖𝑛−2−𝑘𝑖=0𝑛−2𝑘 =0𝑛𝑗=1 for all 𝑥∈𝑅. If 𝛿(1)=0, where 1 stands for the unit element of R, then 𝑑 is a Jordan 𝛿- double derivation. In particular, if 𝛿2(𝑥2)= 𝛿2(𝑥)𝑥+𝑥𝛿2(𝑥)+2(𝛿(𝑥))2, then 𝑑−𝛿22 is an ordinary derivation on 𝑅.Tue, 28 Feb 2017 20:30:00 +0100Computational aspect to the nearest southeast submatrix that makes multiple a prescribed eigenvalue
http://jlta.iauctb.ac.ir/article_530216_113858.html
Given four complex matrices $A$‎, ‎$B$‎, ‎$C$ and $D$ where $Ainmathbb{C}^{ntimes n}$‎ ‎and $D inmathbb{C}^{mtimes m}$ and let the matrix $left( begin{array}{cc}‎ A & B ‎ C & D‎ end{array} right) $ be a normal matrix and‎ assume that $lambda$ is a given complex number‎ ‎that is not eigenvalue of matrix $A$‎. ‎We present a method to calculate the distance norm (with respect to 2-norm) from $D$‎ to the set of matrices $X in C^{m times m}$ such that‎, ‎$lambda$ be a multiple‎ eigenvalue of matrix $left( begin{array}{cc}‎ A & B ‎ C & X‎ end{array} right) $‎. ‎We‎‎also find the nearest matrix $X$ to the matrix $D$‎.Tue, 28 Feb 2017 20:30:00 +0100New best proximity point results in G-metric space
http://jlta.iauctb.ac.ir/article_530221_113858.html
Best approximation results provide an approximate solution to the fixed point equation $Tx=x$, when the non-self mapping $T$ has no fixed point. In particular, a well-known best approximation theorem, due to Fan cite{5}, asserts that if $K$ is a nonempty compact convex subset of a Hausdorff locally convex topological vector space $E$ and $T:Krightarrow E$ is a continuous mapping, then there exists an element $x$ satisfying the condition $d(x,Tx)=inf {d(y,Tx):yin K}$, where $d$ is a metric on $E$. Recently, Hussain et al. (Abstract and Applied Analysis, Vol. 2014, Article ID 837943) introduced proximal contractive mappings and established certain best proximity point results for these mappings in $G$-metric spaces. The aim of this paper is to introduce certain new classes of auxiliary functions and proximal contraction mappings and establish best proximity point theorems for such kind of mappings in $G$-metric spaces. As consequences of these results, we deduce certain new best proximity and fixed point results in $G$-metric spaces. Moreover, we present certain examples to illustrate the usability of the obtained results.Tue, 28 Feb 2017 20:30:00 +0100