Sahand Communications in Mathematical AnalysisSahand Communications in Mathematical Analysis
http://scma.maragheh.ac.ir/
Sun, 21 Apr 2019 18:57:16 +0100FeedCreatorSahand Communications in Mathematical Analysis
http://scma.maragheh.ac.ir/
Feed provided by Sahand Communications in Mathematical Analysis. Click to visit.The Existence Theorem for Contractive Mappings on $wt$-distance in $b$-metric Spaces Endowed ...
http://scma.maragheh.ac.ir/article_34322_5469.html
In this paper, we study the existence and uniqueness of fixed points for mappings with respect to a $wt$-distance in $b$-metric spaces endowed with a graph. Our results are significant, since we replace the condition of continuity of mapping with the condition of orbitally $G$-continuity of mapping and we consider $b$-metric spaces with graph instead of $b$-metric spaces, under which can be generalized, improved, enriched and unified a number of recently announced results in the existing literature. Additionally, we elicit all of our main results by a non-trivial example and pose an interesting two open problems for the enthusiastic readers.Thu, 31 Jan 2019 20:30:00 +0100$C$-class Functions and Common Fixed Point Theorems Satisfying $\varphi $-weakly Contractive ...
http://scma.maragheh.ac.ir/article_31846_5469.html
In this paper, we discuss and extend some recent common fixed point results established by using $varphi-$weakly contractive mappings. A very important step in the development of the fixed point theory was given by A.H. Ansari by the introduction of a $C-$class function. Using $C-$class functions, we generalize some known fixed point results. This type of functions is a very important class of functions which contains almost all known type contraction starting from 1922. year, respectively from famous Banach contraction principle. Three common fixed point theorems for four mappings are presented. The obtained results generalizes several existing onesin literature.We finally propose three open problems.Thu, 31 Jan 2019 20:30:00 +0100Common Fixed Point Theory in Modified Intuitionistic Probabilistic Metric Spaces with Common ...
http://scma.maragheh.ac.ir/article_30018_5469.html
In this paper, we define the concepts of modified intuitionistic probabilistic metric spaces, the property (E.A.) and the common property (E.A.) in modified intuitionistic probabilistic metric spaces.Then, by the commonproperty (E.A.), we prove some common fixed point theorems in modified intuitionistic Menger probabilistic metric spaces satisfying an implicit relation.Thu, 31 Jan 2019 20:30:00 +0100The Uniqueness Theorem for the Solutions of Dual Equations of Sturm-Liouville Problems with ...
http://scma.maragheh.ac.ir/article_34300_5469.html
In this paper, linear second-order differential equations of Sturm-Liouville type having a finite number of singularities and turning points in a finite interval are investigated. First, we obtain the dual equations associated with the Sturm-Liouville equation. Then, we prove the uniqueness theorem for the solutions of dual initial value problems.Thu, 31 Jan 2019 20:30:00 +0100Generalized Regular Fuzzy Irresolute Mappings and Their Applications
http://scma.maragheh.ac.ir/article_32569_5469.html
In this paper, the notion of generalized regular fuzzy irresolute, generalized regular fuzzy irresolute open and generalized regular fuzzy irresolute closed maps in fuzzy topological spaces are introduced and studied. Moreover, some separation axioms and $r$-GRF-separated sets are established. Also, the relations between generalized regular fuzzy continuous maps and generalized regular fuzzy irresolute maps are investigated. As a natural follow-up of the study of r-generalized regular fuzzy open sets, the concept of r-generalized regular fuzzy connectedness of a fuzzy set is introduced and studied.Thu, 31 Jan 2019 20:30:00 +0100Extensions of Saeidi's Propositions for Finding a Unique Solution of a Variational Inequality ...
http://scma.maragheh.ac.ir/article_25887_5469.html
Let $C$ be a nonempty closed convex subset of a real Banach space $E$, let $B: C rightarrow E $ be a nonlinear map, and let $u, v$ be positive numbers. In this paper, we show that the generalized variational inequality $V I (C, B)$ is singleton for $(u, v)$-cocoercive mappings under appropriate assumptions on Banach spaces. The main results are extensions of the Saeidi's Propositions for finding a unique solution of the variational inequality for $(u, v)$-cocoercive mappings in Banach spaces.Thu, 31 Jan 2019 20:30:00 +0100A class of new results in FLM algebras
http://scma.maragheh.ac.ir/article_28459_5469.html
In this paper, we first derive some results by using the Gelfand spectrum and spectrum in FLM algebras. Then, the characterizations of multiplicative linear mappings are also discussed in these algebras.Thu, 31 Jan 2019 20:30:00 +0100Observational Modeling of the Kolmogorov-Sinai Entropy
http://scma.maragheh.ac.ir/article_29983_5469.html
In this paper, Kolmogorov-Sinai entropy is studied using mathematical modeling of an observer $ Theta $. The relative entropy of a sub-$ sigma_Theta $-algebra having finite atoms is defined and then the ergodic properties of relative semi-dynamical systems are investigated. Also, a relative version of Kolmogorov-Sinai theorem is given. Finally, it is proved that the relative entropy of a relative $ Theta $-measure preserving transformations with respect to a relative sub-$sigma_Theta$-algebra having finite atoms is affine.Thu, 31 Jan 2019 20:30:00 +0100A Class of Convergent Series with Golden Ratio Based on Fibonacci Sequence
http://scma.maragheh.ac.ir/article_34323_5469.html
In this article, a class of convergent series based on Fibonacci sequence is introduced for which there is a golden ratio (i.e. $frac{1+sqrt 5}{2}),$ with respect to convergence analysis. A class of sequences are at first built using two consecutive numbers of Fibonacci sequence and, therefore, new sequences have been used in order to introduce a new class of series. All properties of the sequences and related series are illustrated in the work by providing the details including sequences formula, related theorems, proofs and convergence analysis of the series.Thu, 31 Jan 2019 20:30:00 +0100Richardson and Chebyshev Iterative Methods by Using G-frames
http://scma.maragheh.ac.ir/article_31814_5469.html
In this paper, we design some iterative schemes for solving operator equation $ Lu=f $, where $ L:Hrightarrow H $ is a bounded, invertible and self-adjoint operator on a separable Hilbert space $ H $. In this concern, Richardson and Chebyshev iterative methods are two outstanding as well as long-standing ones. They can be implemented in different ways via different concepts.In this paper, these schemes exploit the almost recently developed notion of g-frames which result in modified convergence rates compared with early computed ones in corresponding classical formulations. In fact, these convergence rates are formed by the lower and upper bounds of the given g-frame. Therefore, we can determine any convergence rate by considering an appropriate g-frame.Thu, 31 Jan 2019 20:30:00 +0100Some Fixed Point Results on Intuitionistic Fuzzy Metric Spaces with a Graph
http://scma.maragheh.ac.ir/article_29018_5469.html
In 2006, Espinola and Kirk made a useful contribution on combining fixed point theoryand graph theory. Recently, Reich and Zaslavski studied a new inexact iterative scheme for fixed points of contractive and nonexpansive multifunctions. In this paper, by using the main idea of their work and the idea of combining fixed point theory on intuitionistic fuzzy metric spaces and graph theory, we present some iterative scheme results for $G$-fuzzy contractive and $G$-fuzzy nonexpansive mappings on graphs.Thu, 31 Jan 2019 20:30:00 +0100On Approximate Birkhoff-James Orthogonality and Approximate $\ast$-orthogonality in ...
http://scma.maragheh.ac.ir/article_30861_5469.html
We offer a new definition of $varepsilon$-orthogonality in normed spaces, and we try to explain some properties of which. Also we introduce some types of $varepsilon$-orthogonality in an arbitrary $C^ast$-algebra $mathcal{A}$, as a Hilbert $C^ast$-module over itself, and investigate some of its properties in such spaces. We state some results relating range-kernel orthogonality in $C^*$-algebras.Thu, 31 Jan 2019 20:30:00 +0100Duals of Some Constructed $*$-Frames by Equivalent $*$-Frames
http://scma.maragheh.ac.ir/article_34304_5469.html
Hilbert frames theory have been extended to frames in Hilbert $C^*$-modules. The paper introduces equivalent $*$-frames and presents ordinary duals of a constructed $*$-frame by an adjointable and invertible operator. Also, some necessary and sufficient conditions are studied such that $*$-frames and ordinary duals or operator duals of another $*$-frames are equivalent under these conditions. We obtain a $*$-frame by an orthogonal projection and a given $*$-frame, characterize its duals, and give a bilateral condition for commutating frame operator of a primary $*$-frame and an orthogonal projection. At the end of paper, pre-frame operator of a dual frame is computed by pre-frame operator of a general $*$-frame and an orthogonal projection.Thu, 31 Jan 2019 20:30:00 +0100Rational Geraghty Contractive Mappings and Fixed Point Theorems in Ordered $b_2$-metric Spaces
http://scma.maragheh.ac.ir/article_29263_5469.html
In 2014, Zead Mustafa introduced $b_2$-metric spaces, as a generalization of both $2$-metric and $b$-metric spaces. Then new fixed point results for the classes of rational Geraghty contractive mappings of type I,II and III in the setup of $b_2$-metric spaces are investigated. Then, we prove some fixed point theorems under various contractive conditions in partially ordered $b_2$-metric spaces. These include Geraghty-type conditions, conditions that use comparison functions and almost generalized weakly contractive conditions. Berinde in [17-20] initiated the concept of almost contractions and obtained many interesting fixed point theorems. Results with similar conditions were obtained, textit{e.g.}, in [21] and [22]. In the last section of the paper, we define the notion of almost generalized $(psi ,varphi )_{s,a}$-contractive mappings and prove some new results. In particular, we extend Theorems 2.1, 2.2 and 2.3 of Ciric et.al. in [23] to the setting of $b_{2}$-metric spaces. Also, some examples are provided to illustrate the results presented herein and several interesting consequences of our theorems are also provided. The findings of the paper are based on generalization and modification of some recently reported theorems in the literature.Thu, 31 Jan 2019 20:30:00 +0100Surjective Real-Linear Uniform Isometries Between Complex Function Algebras
http://scma.maragheh.ac.ir/article_30145_5469.html
In this paper, we first give a description of a surjective unit-preserving real-linear uniform isometry $ T : A longrightarrow B$, where $ A $ and $ B $ are complex function spaces on compact Hausdorff spaces $ X $ and $ Y $, respectively, whenever ${rm ER}left (A, Xright ) = {rm Ch}left (A, Xright )$ and ${rm ER}left (B, Yright ) = {rm Ch}left (B, Yright )$. Next, we give a description of $ T $ whenever $ A $ and $ B $ are complex function algebras and $ T $ does not assume to be unit-preserving.Thu, 31 Jan 2019 20:30:00 +0100Inverse Problem for Interior Spectral Data of the Dirac Operator with Discontinuous Conditions
http://scma.maragheh.ac.ir/article_32917_0.html
In this paper, we study the inverse problem for Dirac differential operators with discontinuity conditions in a compact interval. It is shown that the potential functions can be uniquely determined by the value of the potential on some interval and parts of two sets of eigenvalues. Also, it is shown that the potential function can be uniquely determined by a part of a set of values of eigenfunctions at an interior point and parts of one or two sets of eigenvalues.Fri, 19 Oct 2018 20:30:00 +0100A Full-NT Step Infeasible Interior-Point Algorithm for Mixed Symmetric Cone LCPs
http://scma.maragheh.ac.ir/article_34483_0.html
An infeasible interior-point algorithm for mixed symmetric cone linear complementarity problems is proposed. Using the machinery of Euclidean Jordan algebras and Nesterov-Todd search direction, the convergence analysis of the algorithm is shown and proved. Moreover, we obtain a polynomial time complexity bound which matches the currently best known iteration bound for infeasible interior-point methods.Sun, 03 Mar 2019 20:30:00 +0100A Subclass of Analytic Functions Associated with Hypergeometric Functions
http://scma.maragheh.ac.ir/article_34484_0.html
In the present paper, we have established sufficient conditions for Gaus-sian hypergeometric functions to be in certain subclass of analytic univalent functions in the unit disc $mathcal{U}$. Furthermore, we investigate several mapping properties of Hohlov linear operator for this subclass and also examined an integral operator acting on hypergeometric functions.Sun, 03 Mar 2019 20:30:00 +0100Some observations on Dirac Measure-Preserving Transformations and their Results
http://scma.maragheh.ac.ir/article_34485_0.html
Dirac measure is an important measure in many related branches to mathematics. The current paper characterizes measure-preserving transformations between two Dirac measure spaces or a Dirac measure space and a probability measure space. Also, it studies isomorphic Dirac measure spaces, equivalence Dirac measure algebras, and conjugate of Dirac measure spaces. The equivalence classes of a Dirac measure space and its measure algebras are presented. Then all of measure spaces that are isomorphic with a Dirac measure space are characterized and the concept of a Dirac measure class is introduced and its elements are characterized. More precisely, it is shown that every absolutely continuous measure with respect to a Dirac measure belongs to the Dirac measure class. Finally, the relation between Dirac measure preserving transformations and strong-mixing is studied.Sun, 03 Mar 2019 20:30:00 +0100A Class of Hereditarily $\ell_p(c_0)$ Banach spaces
http://scma.maragheh.ac.ir/article_34486_0.html
We extend the class of Banach sequence spaces constructed by Ledari, as presented in ''A class of hereditarily $ell_1$ Banach spaces without Schur property'' and obtain a new class of hereditarily $ell_p(c_0)$ Banach spaces for $1leq p<infty$. Some other properties of this spaces are studied.Sun, 03 Mar 2019 20:30:00 +0100Fuzzy Best Simultaneous Approximation of a Finite Numbers of Functions
http://scma.maragheh.ac.ir/article_34488_0.html
Fuzzy best simultaneous approximation of a finite number of functions is considered. For this purpose, a fuzzy norm on $Cleft (X, Y right )$ and its fuzzy dual space and also the set of subgradients of a fuzzy norm are introduced. Necessary case of a proved theorem about characterization of simultaneous approximation will be extended to the fuzzy case.Mon, 04 Mar 2019 20:30:00 +0100On the Linear Combinations of Slanted Half-Plane Harmonic Mappings
http://scma.maragheh.ac.ir/article_34489_0.html
‎In this paper, the sufficient conditions for the linear combinations of slanted half-plane harmonic mappings to be univalent and convex in the direction of $(-gamma) $ are studied. Our result improves some recent works. Furthermore, a illustrative example and imagine domains of the linear combinations satisfying the desired conditions are enumerated.Mon, 04 Mar 2019 20:30:00 +0100Fekete-SzegĂ¶ Problem of Functions Associated with Hyperbolic Domains
http://scma.maragheh.ac.ir/article_34490_0.html
In the field of Geometric Function Theory, one can not deny the importance of analytic and univalent functions. The characteristics of these functions including their taylor series expansion, their coefficients in these representations as well as their associated functional inequalities have always attracted the researchers. In particular, Fekete-Szegö inequality is one of such vastly studied and investigated functional inequality. Our main focus in this article is to investigate the Fekete-Szegö functional for the class of analytic functions associated with hyperbolic regions. Tofurther enhance the worth of our work, we include similar problems for the inverse functions of these discussed analytic functions.Mon, 04 Mar 2019 20:30:00 +0100On Periodic Shadowing Property
http://scma.maragheh.ac.ir/article_34858_0.html
In this paper, some properties of the periodic shadowing are presented. It is shown that a homeomorphism has the periodic shadowing property if and only if so does every lift of it to the universal covering space. Also, it is proved that continuous mappings on a compact metric space with the periodic shadowing and the average shadowing property also have the shadowing property and then are chaotic in the sense of Li-Yorke. Moreover, any distal homeomorphisms on a compact metric space with the periodic shadowing property do not have the asymptotic average shadowing property.Sat, 13 Apr 2019 19:30:00 +0100Admissible Vectors of a Covariant Representation of a Dynamical System
http://scma.maragheh.ac.ir/article_34859_0.html
In this paper, we introduce admissible vectors of covariant representations of a dynamical system which are extensions of the usual ones, and compare them with each other. Also, we give some sufficient conditions for a vector to be admissible vector of a covariant pair of a dynamical system. In addition, we show the existence of Parseval frames for some special subspaces of $L^2(G)$ related to a uniform lattice of $G$.Sat, 13 Apr 2019 19:30:00 +0100Functors Induced by Cauchy Extension of C$^\ast$-algebras
http://scma.maragheh.ac.ir/article_34860_0.html
In this paper, we give three functors $mathfrak{P}$, $[cdot]_K$ and $mathfrak{F}$ on the category of C$^ast$-algebras. The functor $mathfrak{P}$ assigns to each C$^ast$-algebra $mathcal{A}$ a pre-C$^ast$-algebra $mathfrak{P}(mathcal{A})$ with completion $[mathcal{A}]_K$. The functor $[cdot]_K$ assigns to each C$^ast$-algebra $mathcal{A}$ the Cauchy extension $[mathcal{A}]_K$ of $mathcal{A}$ by a non-unital C$^ast$-algebra $mathfrak{F}(mathcal{A})$. Some properties of these functors are also given. In particular, we show that the functors $[cdot]_K$ and $mathfrak{F}$ are exact and the functor $mathfrak{P}$ is normal exact.Sat, 13 Apr 2019 19:30:00 +0100Common Fixed Point In Cone Metric Space For $\mathbf{s}-\mathbf{\phi}-Contractive$
http://scma.maragheh.ac.ir/article_34861_0.html
Huang and Zhang cite{Huang} have introduced the concept of cone metric space where the set of real numbers is replaced by an ordered Banach space. Shojaei cite{shojaei} has obtained points of coincidence and common fixed points for s-Contraction mappings which satisfy generalized contractive type conditions in a complete cone metric space.In this paper, the notion of complete cone metric space has been introduced. We have defined $s-phi$-contractive and obtained common fixed point theorem for a mapping $f,s$ which satisfies $s-phi$-contractive.Sat, 13 Apr 2019 19:30:00 +0100Some Results on Polynomial Numerical Hulls of Perturbed Matrices
http://scma.maragheh.ac.ir/article_34868_0.html
In this paper, the behavior of the pseudopolynomial numerical hull of a square complex matrix with respect to structured perturbations and its radius is investigated.Sat, 13 Apr 2019 19:30:00 +0100A New Model for the Secondary Goal in DEA
http://scma.maragheh.ac.ir/article_34893_0.html
The purpose of the current paper is to propose a new model for the secondary goal in DEA by introducing secondary objective function. The proposed new model minimizes the average of the absolute deviations of data points from their median. Similar problem is studied in a related model by Liang et al. (2008), which minimizes the average of the absolute deviations of data points from their mean. By using two well known data sets, which are also used by Liang et al.(2008), and Greene (1990) we compare the results of the proposed new model and several other models.Sat, 13 Apr 2019 19:30:00 +0100Certain inequalities for a general class of analytic and bi-univalent functions
http://scma.maragheh.ac.ir/article_34894_0.html
In this work, the subclass of the function class S of analytic and bi-univalent functions is defined and studied in the open unit disc. Estimates for initial coefficients of Taylor- Maclaurin series of bi-univalent functions belonging these class are obtained. By choosing the special values for parameters and functions it is shown that the class reduces to several earlier known classes of analytic and biunivalent functions studied in the literature. Coclusions are given for all special parameters and the functions. And finally, some relevant classes which are well known before are recognized and connections to previus results are made.Sat, 13 Apr 2019 19:30:00 +0100On the Structure of Metric-like Spaces
http://scma.maragheh.ac.ir/article_34895_0.html
The main purpose of this paper is to introduce several concepts of the metric-like spaces. For instance, we define concepts such as equal-like points, cluster points and completely separate points. Furthermore, this paper is an attempt to present compatibility definitions for the distance between a point and a subset of a metric-like space and also for the distance between two subsets of a metric-like space. In this study, we define the diameter of a subset of a metric-like space, and then we provide a definition for bounded subsets of a metric-like space. In line with the aforementioned issues, various examples are provided to better understand this space.Sat, 13 Apr 2019 19:30:00 +0100