عنوان رویداد:
دانشگاه اصفهان
تاریخ برگزاری : 14 اسفند 1398
In this lecture, we consider a class of generalized point- wise noncyclic contractions and present a best proximity pair the- orem for such mappings in the setting of strictly convex Banach spaces. We also discuss on the existence of a common best proxim- ity points for an arbitrary family of relatively nonexpansive map- pings by using a geometric notion of complete proxim و...
In this paper, two fixed point theorems for generalized contractions with constants in a complete metric space is presented. و...
In this paper, we introduce the concept of Menger probabilistic normed Riesz spaces. Next, we investigate the Hyers Ulam Rassias stability of preserving lattice cubic functional equation in Menger probabilistic normed Riesz spaces. و...
In this paper, we study American option problem un- der di erent methods and conditions. First, we consider Amer- ican put option pricing under regime switching model (based on fron- xing transformation and the calculation of optimal stopping boundary) and by calculating the optimal stopping boundary, we obtain a stable solution. In fact, this solution is the best price in و...
In this paper, we consider strong well-posedness for a class of variational inequalities and obtain some equivalence results for them. Moreover, we show that the existence and uniqueness of solution for a split variational inequality is equivalent to the strong well-posedness. و...
. In this paper, first we demonstrate the Himmelberg .fixed point theorem of and some basic concepts of game theory Then we apply this theorem to describe the conditions for existence of Nash equilibrium in strategic games. Finally, we show that some of the preceding theorems in game theory come as a corollary of our theorem 1. Intro و...
In this talk we give some new results on wMB-property of order p. The relation between wMB-property of order p and Reciprocal Dunford-Pettis property of order p on Banach spaces will be discussed. Also we characterize Banach Spaces which have wMB-property of order p respect to relatively norm compact sets. و...
In this paper, at first, we introduce α_μ-admissible Z_μ -contraction, α_μ-admissible and N_μ-contraction via stimulation functions. We prove some new fixed point theorems for defined class of contractions via α-admissible stimulation mappings as well. Our results can be viewed as extension of the corresponding results in this area. Moreover, some examples and an application to و...
گروه نیم توپولوژیکی یک گروه جبری است همراه با یک توپولوژی روی آن بطوریکه نگاشت ضرب در هر متغیر به طور جداگانه پیوسته باشد. در اینجا نشان می دهیم که اگر G یک گروه نیم توپولوژیکی و G یک فضای بئر باشد، آنگاه G, یک گروه توپولوژیکی است اگر و تنها اگر روی پیوسته ضعیف باشد. و...
There are several results on the perturbation of frame sequences in Hilbert spaces that have introduced by Christensen. We state some results on the perturbation of dual frames. و...
Using the concept of p-angular distance, we introduce a new orthogo- nality in normed linear spaces which extends the Singer and isosceles orthogonali- ties. It is proved that this orthogonality has α-existence and α-diagonal existence properties. Moreover, we give some global bounds for these α’s. و...
In this paper, we consider some fundamental properties of a substitution vector-valued integral operator $T^{u}_{varphi}$ from Orlicz space $L^{ heta}(mu)$ to Hilbert space $mathcal{H}$ by the language of conditional expectation operators. We investigate the problem of conditions on the generating Young functions, the functions $u$, $varphi$ and $h=d(mucircvarphi^{ و...
Let ${mathcal B}$ be a symmetric abstract Segal algebra of a Banach algebra ${mathcal A}$ and let $varphi $ be a non-zero character on ${mathcal A}$. In this paper, under some conditions on ${mathcal B}$, we will show that the set of topologically left invariant $varphi$-means on ${mathcal B}^*$ and on ${mathcal A}^*$ have the same cardinality. و...
In this paper, we investigate subspace-diskcyclicity of weighted shifts. We show that any power of a hypercyclic weighted shift and the direct sum of a hypercyclic weighted shift with itself, are subspace-diskcyclic. Also, we give some sufficient conditions for forward shifts and backward shifts to be subspace-diskcyclic. و...
In this note, we give general necessary and sufficient conditions for weak module amenability of triangular Banach al- gebras. Consequently, we improve several known results on this topic. و...
فرض کنیم $E$ یک مشبکه‌ی باناخ و $E_{uo}^{ ext{~}}$ دوگان ترتیبی بی‌کران آن باشد. بزرگترین ایده‌آل بسته‌ی نرمی $E$ با $E^{a}$ نشان داده می‌شود و بخش پیوسته‌ی ترتیبی آن نامیده می‌شود. دراین مقاله نشان داده می‌شود که $ E_{uo}^{ ext{~}}$ بخش پیوسته‌ی ترتیبی $E_{n}^{ ext{~}}$ می‌باشد. و...
در این مقاله قاب های در هم تنیده را در فضاهای هیلبرت مورد بررسی قرار می دهیم که کاربرد زیادی در پردازش سیگنال دارند. همچنین بهترین کاندید برای در هم تنیدگی دو قاب را بررسی می کنیم که دوگان یک قاب و تصویر یک قاب تحت یک عملگر کراندار بهترین کاندید هستند. همچنین شرط لازم و کافی برای در هم تنیدگی قاب و دوگان آن را مورد بررسی قرار می دهیم. و...
The existence of at least three weak solutions for some singular elliptic Dirichlet problems involving the $p$-Laplacian, are established using the variational methods in critical point theory. و...
The gradient-projection algorithm (GPA) plays an important role in solving constrained convex minimization problems. In this paper, we combine the GPA and averaged mapping approach to propose an explicit composite iterative scheme for finding a common solution of a generalized equilibrium problem and a constrained convex minimization problem. Then, we prove a strong converg و...
Let $E$ be a Hilbert module on unital $C^{*}-$algebra $A$ and $P$ be a strictly positive element of $mathbb{B}(E)$. In this paper we show that if $ varphi:mathbb{B}_{P}(E) ightarrow mathbb{B}_{P}(E)$ is a unital linear map which preserves $P-$unitary elements, then $varphi$ is a Jordan homomorphism. و...
Let $A$ and $B$ be nonempty subsets of a metric space $(X,d)$ and self mapping $T:Acup B o Acup B$ be a cyclic map. In 2013 Amini-Harandi [`Best proximity point theorems for cyclic strongly quasi-contraction mappings , J. Global Optim. 56 (2013), 1667-1674] introduced the notion of maps called cyclic strongly quasi-contraction, with adding the condition % egin{alig و...
We introduce and investigate the concept of Dunford Pettis weakly completely continuous and also almost limited (DP) weakly completely continuous operators on Banach lattices and we give some properties of them related to some well known classes of operators and specially, related to the RDP* and BD property of the Banach lattice E و...
In this paper, after introducing continuous, injective and sequentially convergent mapping on a group, a generalization of Kannan and Chatterjea’s fixed point theorems on Banach groups is presented. و...
In this paper, we propose a new iterative method with the help of the gradient-projection algorithm (GPA) for finding a common solution of a constrained convex minimization problem and a fixed point problem. Then, we prove a strong convergence theorem which improves and extends some recent results. و...
In this paper, we derive a new existence theorem for the generalized set-valued mixed variational inequality in reflexive Banach spaces by asymptotic analysis. و...
In this talk, we discuss on the the concept of "ultrametrization" of a metric space, which is the greatest nonexpansive ultrametric image of that metric. Then, we give a counterpart of the ultrametrization notion in the setting of diversitiess. و...
Shearlet frames are used to solve N-dimensional heat equation numerically. The proposed method is mathematically simple and fast. To demonstrate the performance and efficiency of the developed formulation an example in the case of two-dimensions is presented. By this approach the coefficients of the shearlet frame expansion are obtained via separate time independent partia و...
In this paper, we consider the subspace-hypercyclicity of recurrent weighted shifts. We show that there are subspace- hypercyclic weighted shifts that are not recurrent. Moreover, we give a sufficient condition for an invertible and recurrent weighted shift operator such that both the operator and its inverse be subspace- hypercyclic. و...
فرض کنیم xفضای هاسدورف فشرده باشد و Aجبر باناخ جابجایی یکدار باشد و Ą جبر تابعی A- مقداری روی X باشد.در اینجا ارتباط بین شرایط دتکین و داشتن BTRs را بررسی میکنیم و...
در این مقاله تخمینهای جدیدی را برای نرم اساسی عملگرهای ترکیبی وزندار تعمیم‌یافته از برخی فضاهای توابع تحلیلی بتوی فضاهای از نوع وزندار ارائه میکنیم. فضاهای تحلیلی مورد نظر شامل فضاهای بلاخ، زیگموند و از نوع وزندار هستند. تخمینهای بدست آمده برای نرمهای اساسی، منجر به شرایط لازم و کافی برای فشردگی عملگرهای مورد نظر میگردند. همچنین بهعنوان کاربردی دیگر از این نتایج، تخمین و...
We consider non-convex variational problems. We im- prove the existence results for feasible solutions and obtain a nec- essary and sucient condition for the existence solution of these problems. و...
In this paper, the concept of generalized set-valued cyclic almost contraction mappings is introduced and the existence of approximate best proximity points for such mappings on a metric space is established. We also obtain the approximate best proximity for different classes of cyclic mappings in a metric space. و...
با استفاده از تئوری نقطه بحرانی، معیارهایی برای وجود حداقل سه جواب برای یک کلاس از معادلات دیفرانسیل استورم-لیوویل با شرایط ضربه ای تحت فرضیات مختلف و در فاصله دقیقی از پارامتر λ داده خواهد شد. و...
For a locally compact group $G$, the $p$-analog of the Fourier-Stieltjes algebra is denoted by $B_p(G)$. In this paper, we will show that every $p$-completely contractive homomorphism $Phi :B_p(G) ightarrow B_p(H)$, under extra continuity assumption, is a weighted map $Phi_alpha(u)=ucircalpha$, for a continuous affine map $alpha :Ysubset H ightarrow G$, where $Y$ is an open cos و...
In this paper, we consider the generalized vector equilibrium problems in the setting of vector spaces. Then we establish a set-valued version of Farakas s lemma in the setting of real ordered vector spaces. By using it, we give several optimality conditions for solutions of generalized vector equilibrium problems. و...
Let $mathfrak A$, $A$ and $B$ be Banach algebras such that $A$ and $B$ are Banach $mathfrak A$-bimodule and let $M$ be a Banach $(A,B)$-$mathfrak{A}$-module. Let $mathcal{T}={hbox {Tri}}(A,B,M)$ be triangular Banach algebra. In this paper, we examine the relationship between $mathfrak{A}$-module Lie derivations on $ A $ and $ B $ and $ mathfrak{T} $-module Lie de و...
Abstract. In this paper, we show the existence of nontrivial solution to the Kirchhoff type quasilinear elliptic equation without an Ambrosetti-Rabinowitz growth condition. For this, we show the existence of a Cerami sequence by using a variant of the mountainpass theorem due to Schechter. و...
In the following text we introduce weighted generalized shifts, moreover in well--defined cases we compute the norm of its restriction to $ell^p(Gamma)$ $(p in [1, infty) )$ (in particular $ell^2(Gamma)$ and Hilbert spaces). The text is motivated with counterexamples. و...
In this paper, first we find norms of hyponormal weighted composition operators $C_{psi,varphi}$, when $varphi$ has a Denjoy-Wolff point on the unit circle. Then for $varphi$ which is analytic self-map of $mathbb{D}$ with a fixed point in $mathbb{D}$, we investigate norms of hyponormal weighted composition operators $C_{psi,varphi}$. و...
In this paper we present some results of Heinz mean inequalities for $ au$-measurable operators. We use the method of F. Kittaneh, M. Hayajneh and S. Hayajneh, to obtain results for $ au$-measurable operators. و...
In this paper, the stability of functional equations is investigated in the Hyers-Ulam-Rassias concept. With the fixed point alternative approach, we have shown that the lattice derivations are stable under certain conditions Hyers Ulam Rassias sense. و...
In this paper, we stochastically compare Harris family distributions having random tilt parameter with Harris family distributions having fixed tilt parameter. In reliability context, this applies to stochastic comparison of lifetime of a series system with random number of components with another similar but mixed system. Our comparison tools are various types of orderings. In و...
$H^*$-algebra is defined by Warren Ambrose. These structure are complete algebra w.r.t. norm $| cdot |_mathcal{A}$ that corresponding with inner product $leftlangle cdot , cdot ight angle_mathcal{A}$. Trace class is a sub-algebra of $H^*$-algebra and define on it a trace norm $ au(cdot)$. The space $( au(mathcal{A}), au(cdot))$ is a complete sub-a و...
In this note, we consider certain vector-valued function algebras and investigate their shilov boundaries و...
For suitable Banach spaces X and Y with Schauderdecompositions and closed subspace M of some compact operatorsspace from X to Y , it is shown that the complete continuity of allevaluation operators on M , is a sufficient condition for the weaknormal structure of the dual M ∗ of M ; where for each x ∈ X andy ∗ ∈ Y ∗ , the evaluation operators on M is .defined by ϕx (T ) = T xand ψ و...
In this paper, we discuss about hypercyclic properties of composition operators on lorentz spaces. و...
In the following text we classify all ``appropriate weighted generalized shift isomorphisms on $ell^p(Gamma)$ for nonempty set $Gamma$ and $pin[1,infty]$. و...
We study the problem of optimal boundary control at one end of a string for the case of a given displacement mode at the other end in the space W_p^1 (M_T). The problem is studied in the sense of a generalized solution of the corresponding mixed initial-boundary value problem in the Sobolev space. We also study the problem of choosing an optimal boundary control from infinitely و...
In this talk, using a certain sequence of spectral projections, we provide a noncommutative version of Ottaviani inequality for measurable operators affiliated with a von Neumann algebra M equipped with a faithful normal finite trace. As a corollary, we obtain a relation of the convergence in measure and almost sure convergence. و...
We shall prove a multiplicity result for an elliptic problem with a super-critical nonlinearity. Our methodology is based on a variational principle that allows one to deal with super-critical problems when the standard Euler-Lagrange functional is restricted to certain convex sets. و...
رض کنید $X$ یک مشبکه‌ی برداری و $Y$ یک زیرمشبکه از $X$ باشد. فرض کنید $overline{Y}^{circ} $، بستار ترتیبی $Y$ باشد که شامل تمام حدود ترتیبی تورهایی در $Y$ می‌باشد و $overline{Y}^{ucirc}$، بستار ترتیبی بی کران $Y$ باشد که شامل تمام حدود ترتیبی بی کران تورهایی در $Y$ است. $ و...
تكنيك آناليز مقدماتي خطر(Preliminary Hazard Analysis (PHA)) براي اولين بار در اوايل دهه 50 ميلادي در ايالات متحده آمريكا براي آناليز ايمني موشكهاي با پيش برنده مايع بكار گرفته شد. اين روش توسط صنايع هوانوردي اين كشور بصورت قانونمند در آمده و بوسيله شركت بوئينگ تحت نام فعلي نامگذاري شد. پس از اين كاربرد اين تكنيك به صنايع مختلف منجمله صنايع شيميايي، هسته اي و غيره گسترش يافت. و...
Let $A$ and $B$ be complex unital Banach algebras and $varphi: A ightarrow B $ be a unital bijective linear map which preserves Schur stable elements in both direction. we show that if $A$ and $B$ are commutative and $B$ is semi-simple, then $varphi$ is an isomorphism, also if $A$ and $B$ are $C^{*}-$algebras and $B$ is commutative, then $varphi$ is a $*-$Jordan isomorphis و...
In this paper, we introduce a notion of approximate Connes-biprojectivity for dual Banach algebras. We study the relation between approximate Connes-biprojectivity, approximate Connes amenability and $varphi$-Connes amenability. We propose a criterion to show that certain dual triangular Banach algebras are not approximately Connes-biprojective. Next we show that for a locally و...
Following the concept of equicompact and uniformly completely continuous sets of compact operators, we introduce the concept of uniformly limited completely continuous sets, we obtain some characterizations of it with respect to some well known geometric properties of Banach spaces, such as, DP* property and Gelfand-Phillips property و...
For $alpha>0$, the $alpha$-Bloch space is the space of all analytic functions $f$ on the unit disk $mathbb{D}$ satisfying $$sup_{zinmathbb{D}}|f (z)|(1-|z|^2)^alpha0$ and $etageq 0$ such that $alpha+eta<1$. و...
In this paper we introduce a generalization of martingales for discrete parameter case in Riesz spaces and present some properties for this generalization in Riesz spaces. Indeed, this generalization is the analogue of martingale property whenever the Ito integral is defined for non-adapted integrands. و...
In this talk, we study the existence of multiple weak solutions for a kind of elliptic problem with Neumann boundary condition. The main tool is the Mounatin Pass theorem. و...
In this article, Using the variational method and critical point theory, we prove the existence two weak solutions for a p, q)-Laplacian boundary value problem with singular nonlinearities) .in a smooth bounded domain in R^N و...
In this paper, we represent the necessary and sufficient conditions for the closedness of the numerical range of a compact composition operator acting on weighted Hardy spaces H^{p}(B) و...
In this paper, we prove that if there exists uniform embedding between metrically convex space X and Banach space E then X admits a strong embedding into l_p(E); for any p in (1;intfy): و...
In this paper, we investigate the numerical range of $C_{psi,varphi}$, when $varphi$ has a fixed point in $mathbb{D}$. و...
Let (M,g) be smooth a compact Riemannian manifold of dimension n≥3 where g denotes the metric tensor. We consider the existence of weak solutions for the following nonlinear Dirichlet problem driven the(p.q)-Laplacian operator -(Δ_p )_g u-μ(Δ_q )_g u+u^(p-1)+μu^(q-1)=f(x,u,∇_g u) where (Δ_p )_g and (Δ_q )_g stand for the p-Laplacian and q-Laplacian operators on the Riemannian m و...
This paper will briefly review recent results of what is called the functional analytic approach in studying statistical properties of chaotic dynamical systems. In Particular the different groups of anisotropic Banach spaces adapted to hyperbolic diffeomorphisms are introduced. و...
در اين مقاله، ابتدا توابع تکارز دو طرفه معرفی می شود و سپسبه کارهايی که پژوهشگران در سالهای اخير در خصوصاين رده از توابع انجام داده اند پرداخته ايم، و همچنين به کارهای درحال انجام مربوط به اين دسته از توابع نيز اشاره می شود. و...
For a discrete semigroup algebra $ S $ and a left multiplier operator $ T $ on $ S $, there is a new induced semigroup $S_{T} $, related to $ S $ and $ T $. In this paper, we show that for an inverse semigroup $S$, under the certain conditions on $T$, the first cyclic cohomology groups $ HHCC^{1}(ell^1(S), ell^{infty}(S))$ and $HHCC^{1}(ell^1({S_{T}}), ell^{inf و...
Let $ extbf{M}_{n,m}$ be the set of all $n$-by-$m$ real matrices. A matrix $R$ is called generalized row stochastic $( extit{g-row stochastic})$ if the sum of entries on every row of $R$ is one. For $A$, $B in extbf{M}_{n,m}$, it is said that $A$ is $ extit{rglt-majorized}$ by $B$, and we write $ A prec_{rglt} B$, if there exists an $m$-by-$m$ lower triangular g-row stochas و...
First of all, we obtain a necessary and sufficient condition for a certain operator $T_wC_{varphi}$ to be compact on $A_{alpha}^{2}$. Then, we characterize the essentially normal weighted composition operators $C_{psi,varphi}$ on the weighted Bergman spaces $A_{alpha}^{2}$, when $varphi in mbox{LFT}(mathbb{D})$ is not an automorphism and $psi in H^{infty}$ is continuous at و...
Let Lρ be a modular function space where ρ is a function modular satisfying the ∆2-type condition and is of s-convex type for s ∈ (0, 1]. Under this framework, the existence of fixed points for asymptotically regular mappings defined on some classes of subspaces of Lρ is proved. As a consequence, some previous fixed point results for convex modulars (that is, modulars of 1-conv و...
The purpose of the present, is to prove the existence and convergence result of a Bregman common best proximity point for the pair $(S,T)$ of mappings which entails the approximate solution of a global optimization of multi-objective functions in the setting of Banach spaces. Our results improve and generalize many known results in the current literature. و...
For Banach algebras $mathcal{A}$ and $mathcal{B}$, we show that if the Banach algebra $mathfrak{A}=mathcal{A} imes mathcal{B}$ is unital, then each bi-multiplicative mapping from $mathfrak{A}$ into a semisimple commutative Banach algebra $mathcal{D}$ is jointly continuous. We also prove that every $n$-bi-multiplicative functionals on $mathfrak{A}$ is continuous if and only i و...
In this paper, we find complex symmetric weighted composition operators with special conjugations و...
Let A be an algebra and let ρ: A → A be a linear mapping.A linear mapping T∶ A → A is called a left ρ-centralizer if T(ab) = T(a)ρ(b) for all a,b ϵ A.In this note,we show that the logarithm of a left ρ-centralizer is a generalized derivation under certain conditions. و...
گروه نیم توپولوژیکی یک گروه جبری است همراه با یک توپولوژی روی آن بطوریکه نگاشت ضرب در هر متغیر به طور جداگانه پیوسته باشد. در اینجا نشان میدهیم گروه های نیم توپولوژیکی بئر، گروه توپولوژیکی هستند. و...
In this paper, we introduce a new version of $H$-contradiction for four mappings in a metric space $(X,d)$. Then, we prove the existence and uniqueness of a common best proximity point for four non-self mappings. An example is also given to support our main result. The related fixed point theorem are also proved. و...
In this article, a class of nonlocal and nonvariational elliptic problems with exponent growth conditions is considered. The existence of positive solutions is stated through an iterative method based on mountain pass techniques. و...
در این نوشته سعی داریم قاب های هم جوشی را معرفی کرده ، سپس عملگرهای متناظر با این دسته از قاب ها که به عنوان قاب های زیر فضا نیز نام گذاری می شوند ، معرفی و بررسی کنیم . خواهیم دید که عملگر این دسته از قاب ها با عملگرهای قابی مرتبط هستند و عموما خواص مشابهی دارند . و...
In this paper, we suppose that H is a Hilbert space of functions analytic on a domain . Here, we want to investigate the intertwining multiplication operators on Cowen-Douglas class. و...
Let $mathfrak{A}$, $mathfrak{B}$ and $A$ be Banach algebras such that $A$ is both Banach $mathfrak{A}$-bimodule and Banach $mathfrak{B}$-bimodule. Let $X$ be both Banach $A$-$mathfrak{A}$-module and Banach $A$-$mathfrak{B}$-module. In this paper, we show that [ HH^1_{mathfrak Aoplusmathfrak B}(A,X)subseteq HH^1_{mathfrak A}(A,X)oplus HH^1_{mathfrak B}(A,X). و...
A Hankel matrix is a square matrix in which each ascending skew-diagonal from left to right is constant. A matrix $R$ is called integral row stochastic, if each row has exactly a nonzero entry, +1, and other entries are zero. In the present paper, we describe $L$-ray of a matrix and characterize $L$-rays of integral row stochastic Hankel matrices. We provide an algorithm for و...
Let $mathcal A$ be a Banach algebra with a closed two sided ideal $mathcal{I}$. We introduce $mathcal I$-multipliers of $mathcal A$, and prove that $mathcal{M_I(A)}$, the set of all $mathcal I$-multipliers of $mathcal A$ is a closed subalgebra of $mathcal{B(A)}$ containing ${mathcal M(mathcal A)}$, where $mathcal I$ is an essential ideal of $mathcal A$. Furthermore, we establis و...
We introduce the quasi doubly stochastic operator and modify the Nielsen Theorem in infinite dimensional case by using them. Also we characterize the structure of all majorization preserver maps on $l^1$ under quasi doubly stochastic operators and provide quantum interpretation about convertibility of pure states of a composite system. و...
G. Costakis and A. Manoussos localized the concept of hypercyclicity by introducing certain sets, which they called J -sets. In this paper we give a description of J -sets through the use of open sets with an additional assumption و...
We define the notion of linear polar topologies over the real orcomplex scalars in locally convex cones and prove that every polar topology is isomorphic to the subcone of a linear polar topology و...
In this reaserch we introduce the concept of best coapproximation on Banach lattices with a strong unit. We study the existence problem of best coapproximation in these spaces. Also, we develop the theory of best coapproximation in quotient of Banach lattice spaces and discuss about the relationship between the coproximinal elements of a given space and its quotient space. Fina و...
Here using a new variational principle, we demonstrate the existence of at least one positive solution of a generalized supercritical Neumann problem in the unit ball و...
In this paper, we extend the Baillon s nonlinear mean ergodic theorem for nonexpansive mappings to locally compact Hadamard spaces and Hadamard spaces with constant curvature. و...
We introduce some classes of Banach spaces for which the invariant subspace problem for the shift operator has positive answer. Moreover, we consider some cases of weighted spaces for which the problem remains open. و...
In this paper we study composition operators on vari- able exponent Bergman spaces in the unit disk of the complex plane. We prove that this operators are bounded, and we give a sucient condition for the compactness of composition operators. و...
Excess of frames is a classical and active topic in frame theory. However, excess of g-frames is more complicated. In this paper, we continue to study the excess of a g-frame and try to state it with respect to the excess of its induced discrete frame. و...
In this paper, we study some characterizations of real valued $h$-convex functions. و...
The theory of shift invariant subspaces on locally compact abelian groups has been extremely grown in last two decades. Let $G$ be a locally compact abelian group with a closed, discrete and cocompact subgroup $Gamma$. A closed subspace $V$ of $L^2(G)$ is said to be shift invariant if it is invariant under shifts by elements of $Gamma$. The omission و...
Abstract. Let A ⋉ X be the trivial extension algebra of algebra A by A-bimodule X. The aim of this note, is to give necessary and sufcient conditions under which every Jordan derivation on A⋉X is the sum of a derivation and an antiderivation. We then apply our result to improve some known results on Jordan derivations of trivial extension algebras. و...
In this paper, we introduce a new subclass of the function class of bi-univalent functions that satisfying subordinations in the open unit disk U. Furthermore, we find estimates on the coefficients ja2j; ja3j and ja4j for functions in this new subclass. و...
In this paper, we introduce a new notion of biprojectivity, called $WAP$-biprojectivity for $F(mathcal{A})$, the enveloping dual Banach algebra associated to a Banach algebra $mathcal{A}$. We find some relations between Connes biprojectivity, Connes amenability and this new notion. We show that, for a given dual Banach algebra $mathcal{A}$, if $F(mathcal{A})$ is Connes amenable و...
Let A be an arbitrary Banach algebra and φ a homo- morphism from A onto C. Our rst purpose in this talk is to give some equivalent conditions under which guarantees a φ-mean of norm one. We deal with the problem of when ‖aa_α-φ(a)a_α ‖→0 uniformly for all a in weakly compact subset of A. We show that Banach algebras associated to a locally compact group G is re- sponsive و...
In this paper, we present a Fan-type section Theorem. Here, the result is investigated in some topological spaces which do not necessarily have a linear structure. و...
In this talk, by using the notion of $l_p$-modulus of variation of a function ($pgeq 1$), we introduce a Banach space of functions of generalized bounded variation, denoted $V_p[ u]$, and consider several problems pertinent to the theory of Fourier series in this space. In particular, we first state a Helly-type result and an embedding theorem for $V_p[ u]$. Next و...
فرض کنید (B(H یک*C- جبر متشکل از تمامی عملگرهای خطی و کراندار روی فضای هیلبرت مختلط H همراه با نرم عملگری باشد که دارای یک پایه متعامد یکه است. همچنین فرض کنید A یک *- زیر جبر باناخ از (B(H و Ω یک فضای هاسدرف فشرده همراه با اندازه رادونμ و [α:Ω→[0,1 یک تابع انتگرال‌پذیر باشد. در این صورت ابتدا فضاهای L^P شامل تمام توابع عملگر مقدارِ انتگرال‌پذیر از Ω به A که نسبت به یک L^p-نرم و...
The notion of completeness in locally convex cones have been defined and studded in [2, 6]. In this paper, we consider the completeness in the symmetric topology and present a version of the Cantor s intersection theorem in locally convex quasi-metric cones و...
In this paper, we study weighted composition operators between Banach spaces of scalar-valued Lipschitz functions on pointed metric spaces, not necessarily compact. We also obtain sufficient and necessary conditions for a weighted composition operator between these spaces to be compact. و...