Sahand Communications in Mathematical AnalysisSahand Communications in Mathematical Analysis
http://scma.maragheh.ac.ir/
Sat, 15 Dec 2018 19:44:21 +0100FeedCreatorSahand Communications in Mathematical Analysis
http://scma.maragheh.ac.ir/
Feed provided by Sahand Communications in Mathematical Analysis. Click to visit.On some results in the light of generalized relative Ritt order of entire functions represented ...
http://scma.maragheh.ac.ir/article_23647_0.html
In this paper, we study some growth properties of entire functions represented by a vector valued Dirichlet series on the basis of generalized relative Ritt order and generalized relative Ritt lower order.Wed, 11 Jan 2017 20:30:00 +0100Coherent Frames
http://scma.maragheh.ac.ir/article_32195_5171.html
Frames which can be generated by the action of some operators (e.g. translation, dilation, modulation, ...) on a single element $f$ in a Hilbert space, called coherent frames. In this paper, we introduce a class of continuous frames in a Hilbert space $mathcal{H}$ which is indexed by some locally compact group $G$, equipped with its left Haar measure. These frames are obtained as the orbits of a single element of Hilbert space $mathcal{H}$ under some unitary representation $pi$ of $G$ on $mathcal{H}$. It is interesting that most of important frames are coherent. We investigate canonical dual and combinations of this framesTue, 31 Jul 2018 19:30:00 +0100Extensions of Saeidi's Propositions for finding a unique solution of a variational inequality ...
http://scma.maragheh.ac.ir/article_25887_0.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.Sat, 17 Jun 2017 19:30:00 +0100On Polar Cones and Differentiability in Reflexive Banach Spaces
http://scma.maragheh.ac.ir/article_32215_5171.html
Let $X$ be a Banach space, $Csubset X$ be a closed convex set included in a well-based cone $K$, and also let $sigma_C$ be the support function which is defined on $C$. In this note, we first study the existence of a bounded base for the cone $K$, then using the obtained results, we find some geometric conditions for the set $C$, so that ${mathop{rm int}}(mathrm{dom} sigma_C) neqemptyset$. The latter is a primary condition for subdifferentiability of the support function $sigma_C$. Eventually, we study Gateaux differentiability of support function $sigma_C$ on two sets, the polar cone of $K$ and ${mathop{rm int}}(mathrm{dom} sigma_C)$.Tue, 31 Jul 2018 19:30:00 +0100Some properties of reproducing Kernel Banach and Hilbert spaces
http://scma.maragheh.ac.ir/article_27822_0.html
This paper is devoted to the study of reproducing kernel Hilbert spaces. We focus on multipliers of reproducing kernel Banach and Hilbert spaces. In particular, we try to extend this concept and prove some related theorems. Moreover, we focus on reproducing kernels in vector-valued reproducing kernel Hilbert spaces. In particular, we extend reproducing kernels to relative reproducing kernels and prove some theorems in this subject.Tue, 10 Oct 2017 20:30:00 +0100Meir-Keeler Type Contraction Mappings in $c_0$-triangular Fuzzy Metric Spaces
http://scma.maragheh.ac.ir/article_31436_5171.html
Proving fixed point theorem in a fuzzy metric space is not possible for Meir-Keeler contractive mapping. For this, we introduce the notion of $c_0$-triangular fuzzy metric space. This new space allows us to prove some fixed point theorems for Meir-Keeler contractive mapping. As some pattern we introduce the class of $alphaDelta$-Meir-Keeler contractive and we establish some results of fixed point for such a mapping in the setting of $c_0$-triangular fuzzy metric space. An example is furnished to demonstrate the validity of these obtained results.Tue, 31 Jul 2018 19:30:00 +0100On the Integral Representations of Generalized Relative Type and Generalized Relative Weak Type ...
http://scma.maragheh.ac.ir/article_27953_5171.html
In this paper we wish to establish the integral representations of generalized relative type and generalized relative weak type as introduced by Datta et al [9]. We also investigate their equivalence relation under some certain conditions.Tue, 31 Jul 2018 19:30:00 +0100On character space of the algebra of BSE-functions
http://scma.maragheh.ac.ir/article_27982_0.html
Suppose that $A$ is a semi-simple and commutative Banach algebra. In this paper we try to characterize the character space of the Banach algebra $C_{rm{BSE}}(Delta(A))$ consisting of all BSE-functions on $Delta(A)$ where $Delta(A)$ denotes the character space of $A$. Indeed, in the case that $A=C_0(X)$ where $X$ is a non-empty locally compact Hausdroff space, we give a complete characterization of $Delta(C_{rm{BSE}}(Delta(A)))$ and in the general case we give a partial answer. Also, using the Fourier algebra, we show that $C_{rm{BSE}}(Delta(A))$ is not a $C^*$-algebra in general. Finally for some subsets $E$ of $A^*$, we define the subspace of BSE-like functions on $Delta(A)cup E$ and give a nice application of this space related to Goldstine's theorem.Tue, 17 Oct 2017 20:30:00 +0100On Fuzzy $e$-open Sets, Fuzzy $e$-continuity and Fuzzy $e$-compactness in Intuitionistic Fuzzy ...
http://scma.maragheh.ac.ir/article_28223_0.html
The purpose of this paper is to introduce and study the concepts of fuzzy $e$-open set, fuzzy $e$-continuity and fuzzy $e$-compactness in intuitionistic fuzzy topological spaces. After giving the fundamental concepts of intuitionistic fuzzy sets and intuitionistic fuzzy topological spaces, we present intuitionistic fuzzy $e$-open sets and intuitionistic fuzzy $e$-continuity and other results related topological concepts. Several preservation properties and some characterizations concerning intuitionistic fuzzy $e$-compactness have been obtained.Tue, 31 Oct 2017 20:30:00 +0100$G$-dual Frames in Hilbert $C^{*}$-module Spaces
http://scma.maragheh.ac.ir/article_32196_5171.html
In this paper, we introduce the concept of $g$-dual frames for Hilbert $C^{*}$-modules, and then the properties and stability results of $g$-dual frames are given. A characterization of $g$-dual frames, approximately dual frames and dual frames of a given frame is established. We also give some examples to show that the characterization of $g$-dual frames for Riesz bases in Hilbert spaces is not satisfied in general Hilbert $C^*$-modules.Tue, 31 Jul 2018 19:30:00 +0100On generators in Archimedean copulas
http://scma.maragheh.ac.ir/article_28401_0.html
This study after reviewing construction methods of generators in Archimedean copulas (AC), proposes several useful lemmas related with generators of AC. Then a new trigonometric Archimedean family will be shown which is based on cotangent function. The generated new family is able to model the low dependence structures.Sat, 11 Nov 2017 20:30:00 +0100Some Fixed Point Results for the Generalized $F$-suzuki Type Contractions in $b$-metric Spaces
http://scma.maragheh.ac.ir/article_31379_5171.html
Compared with the previous work, the aim of this paper is to introduce the more general concept of the generalized $F$-Suzuki type contraction mappings in $b$-metric spaces, and to establish some fixed point theorems in the setting of $b$-metric spaces. Our main results unify, complement and generalize the previous works in the existing literature.Tue, 31 Jul 2018 19:30:00 +0100Linear Maps Preserving Invertibility or Spectral Radius on Some $C^{*}$-algebras
http://scma.maragheh.ac.ir/article_23702_5171.html
Let $A$ be a unital $C^{*}$-algebra which has a faithful state. If $varphi:Arightarrow A$ is a unital linear map which is bijective and invertibility preserving or surjective and spectral radius preserving, then $varphi$ is a Jordan isomorphism. Also, we discuss other types of linear preserver maps on $A$.Tue, 31 Jul 2018 19:30:00 +0100A class of new results in FLM algebras
http://scma.maragheh.ac.ir/article_28459_0.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.Tue, 14 Nov 2017 20:30:00 +0100A Coupled Random Fixed Point Result With Application in Polish Spaces
http://scma.maragheh.ac.ir/article_28506_5171.html
In this paper, we present a new concept of random contraction and prove a coupled random fixed point theorem under this condition which generalizes stochastic Banach contraction principle. Finally, we apply our contraction to obtain a solution of random nonlinear integral equations and we present a numerical example.Tue, 31 Jul 2018 19:30:00 +0100Some fixed point results on intuitionistic fuzzy metric spaces with a graph
http://scma.maragheh.ac.ir/article_29018_0.html
In 2006, Espinola and Kirk made a useful contribution on combining fixed point theory and 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.Tue, 19 Dec 2017 20:30:00 +0100Rational Geraghty contractive mappings and fixed point theorems in ordered $b_2$-metric spaces
http://scma.maragheh.ac.ir/article_29263_0.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.Fri, 29 Dec 2017 20:30:00 +0100The Integrating Factor Method in Banach Spaces
http://scma.maragheh.ac.ir/article_31559_5171.html
The so called integrating factor method, used to find solutions of ordinary differential equations of a certain type, is well known. In this article, we extend it to equations with values in a Banach space. Besides being of interest in itself, this extension will give us the opportunity to touch on a few topics that are not usually found in the relevant literature. Our presentation includes various illustrations of our results.Tue, 31 Jul 2018 19:30:00 +0100Observational modeling of the Kolmogorov-Sinai entropy
http://scma.maragheh.ac.ir/article_29983_0.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$-algebra having finite atoms is affine.Fri, 02 Feb 2018 20:30:00 +0100Identification of Initial Taylor-Maclaurin Coefficients for Generalized Subclasses of ...
http://scma.maragheh.ac.ir/article_31813_5171.html
In the present work, the author determines some coefficient bounds for functions in a new class of analytic and bi-univalent functions, which are introduced by using of polylogarithmic functions. The presented results in this paper one the generalization of the recent works of Srivastava et al. [26], Frasin and Aouf [13] and Siregar and Darus [25].Tue, 31 Jul 2018 19:30:00 +0100Common fixed point theory in modified intuitionistic probabilistic metric spaces with common ...
http://scma.maragheh.ac.ir/article_30018_0.html
‎In this paper, we define the concepts of modified mbox{intuitionistic} probabilistic metric spaces, the property (E.A.) and the common property (E.A.) in modified intuitionistic probabilistic metric spaces.Then, by the common property (E.A.), we prove some common fixed point theorems in modified intuitionistic Menger probabilistic metric spaces satisfying an implicit relation.Mon, 05 Feb 2018 20:30:00 +0100On some properties of the max algebra system over tensors
http://scma.maragheh.ac.ir/article_30023_0.html
Recently we generalized the max algebra system to the class of nonnegative tensors. In this paper we give some basic properties for the left (right) inverse, under the new system. The existence of order 2 left (right) inverse of tensors is characterized. Also we generalize the direct product of matrices to the direct product of tensors (of the same order, but may be different dimensions) and investigate its properties relevant to the spectral theory.Mon, 05 Feb 2018 20:30:00 +0100$(-1)$-Weak Amenability of Second Dual of Real Banach Algebras
http://scma.maragheh.ac.ir/article_33302_0.html
Let $ (A,| cdot |) $ be a real Banach algebra, a complex algebra $ A_mathbb{C} $ be a complexification of $ A $ and $ | | cdot | | $ be an algebra norm on $ A_mathbb{C} $ satisfying a simple condition together with the norm $ | cdot | $ on $ A$. In this paper we first show that $ A^* $ is a real Banach $ A^{**}$-module if and only if $ (A_mathbb{C})^* $ is a complex Banach $ (A_mathbb{C})^{**}$-module. Next we prove that $ A^{**} $ is $ (-1)$-weakly amenable if and only if $ (A_mathbb{C})^{**} $ is $ (-1)$-weakly amenable. Finally, we give some examples of real Banach algebras which their second duals of some them are and of others are not $ (-1)$-weakly amenable.Fri, 30 Nov 2018 20:30:00 +0100The solvability of concave-convex quasilinear elliptic systems involving $p$-Laplacian and ...
http://scma.maragheh.ac.ir/article_30802_0.html
In this work, we study the existence of non-trivial multiple solutions for a class ofquasili near elliptic systems equipped with concave-convex nonlinearities and critical growth terms in bounded domains. By using the variational method, especially Nehari manifold and Palais-Smale condition, we prove the existence and multiplicity results of positive solutions.Tue, 10 Apr 2018 19:30:00 +0100Inequality problems of equilibrium problems with application
http://scma.maragheh.ac.ir/article_30860_0.html
This paper aims at establishing the existence of results for a nonstandard equilibrium problems $(EP_{N})$. The solutions of this inequality are discussed in a subset $K$ (either bounded or unbounded) of a Banach spaces $X$. Moreover, we enhance the main results by application of some differential inclusion.Mon, 23 Apr 2018 19:30:00 +0100On approximate Birkhoff-James orthogonality and approximate $\ast$-orthogonality in ...
http://scma.maragheh.ac.ir/article_30861_0.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.Mon, 23 Apr 2018 19:30:00 +0100A certain class of character module homomorphisms on normed algebras
http://scma.maragheh.ac.ir/article_31199_0.html
For two normed algebras $A$ and $B$ with the character space $bigtriangleup(B)neq emptyset$ and a left $B-$module $X,$ a certain class of bounded linear maps from $A$ into $X$ is introduced. We set $CMH_B(A, X)$ as the set of all non-zero $B-$character module homomorphisms from $A$ into $X$. In the case where $bigtriangleup(B)=lbrace varphirbrace$ then $CMH_B(A, X)bigcup lbrace 0rbrace$ is a closed subspace of $L(A, X)$ of all bounded linear operators from $A$ into $X$. We define an equivalence relation on $CMH_B(A, X)$ and use it to show that $CMH_B(A, X)bigcuplbrace 0rbrace $ is a union of closed subspaces of $L(A, X)$. Also some basic results and some hereditary properties are presented. Finally some relations between $varphi-$amenable Banach algebras and character module homomorphisms are examined.Sun, 27 May 2018 19:30:00 +0100The norm estimates of pre-Schwarzian derivatives of spirallike functions and uniformly convex ...
http://scma.maragheh.ac.ir/article_31361_0.html
For a constant $alphain left(-frac{pi}{2},frac{pi}{2}right)$, we define a subclass of the spirallike functions, $SP_{p}(alpha)$, the set of all functions $fin mathcal{A}$[Releft{e^{-ialpha}frac{zf'(z)}{f(z)}right}geqleft|frac{zf'(z)}{f(z)}-1right|.]In the present paper, we shall give the estimate of the norm of the pre-Schwarzian derivative $mathrm{T}_f=f''/f'$ where $|mathrm{T}_f|=sup_{zin Delta} (1-|z|^2)|mathrm{T}_f(z)|$ for the functions in $SP_{p}(alpha)$.Sat, 09 Jun 2018 19:30:00 +0100$L^p$-Conjecture on hypergroups
http://scma.maragheh.ac.ir/article_31386_0.html
In this paper, we study $L^p$-conjecture on locally compact hypergroups and by some technical proofs we give some sufficient and necessary conditions for a weighted Lebesgue space $L^p(K,w)$ to be a convolution Banach algebra, where $1<p<infty$, $K$ is a locally compact hypergroup and $w$ is a weight function on $K$. Among the other things, we also show that if $K$ is a locally compact hypergroup and $p$ is greater than 2, $K$ is compact if and only if $m(K)$ is finite and $fast g$ exists for all $f,gin L^p(K)$, where $m$ is a left Haar measure for $K$, and in particular, if $K$ is discrete, $K$ is finite if and only if the convolution of any two elements of $L^p(K)$ exists.Mon, 11 Jun 2018 19:30:00 +0100On regular generalized $\delta$-closed sets in topological spaces
http://scma.maragheh.ac.ir/article_31670_0.html
In this paper a new class of sets called regular generalized $delta$-closed set (briefly rg$delta$-closed set)is introduced and its properties are studied. Several examples are provided to illustrate the behaviour of these new class of sets.Sat, 30 Jun 2018 19:30:00 +0100Richardson and Chebyshev Iterative Methods by Using G-frames
http://scma.maragheh.ac.ir/article_31814_0.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 $. In this concern, Richardson and Chebyshev iterative methods are two outstanding as well as long-standing ones. They can be implemented in different ways via different concepts.In this paper, these schemes exploit the almost recently developed notion of g-frames which result in modified convergence rates compared with early computed ones in corresponding classical formulations. In fact, these convergence rates are formed by the lower and upper bounds of the given g-frame. Therefore, we can determine any convergence rate by considering an appropriate g-frame.Tue, 10 Jul 2018 19:30:00 +0100$C$-class functions and common fixed point theorems satisfying $\varphi $-weakly contractive ...
http://scma.maragheh.ac.ir/article_31846_0.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 ones in literature.We finally propose three open problems.Sat, 14 Jul 2018 19:30:00 +0100Generalized Regular Fuzzy Irresolute Mappings and Their Applications
http://scma.maragheh.ac.ir/article_32569_0.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.Fri, 21 Sep 2018 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 +0100Surjective real-Linear uniform isometries between complex function algebras
http://scma.maragheh.ac.ir/article_30145_0.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.Fri, 23 Feb 2018 20:30:00 +0100