**Volume 10 (2021)**

**Volume 09 (2020)**

**Volume 08 (2019)**

**Volume 07 (2018)**

**Volume 06 (2017)**

**Volume 05 (2016)**

**Volume 04 (2015)**

**Volume 03 (2014)**

**Volume 02 (2013)**

**Volume 01 (2012)**

# Main Subjects = Functional analysis
Number of Articles: 35

##### 1. A new implicit iteration process for approximating common fixed points of $\alpha$-demicontraction semigroup

*Volume 10, Issue 01 , Winter 2021, , Pages 19-34*

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**Abstract **

It is our purpose in this paper to introduce the concept of $\alpha$-demicontractive semigroup. Also, we construct a new implicit iterative scheme for approximating the common fixed points of $\alpha$-demicontractive semigroup. We prove strong convergence of our new iterative scheme to the common fixed ...
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##### 2. On new types of contraction mappings in bipolar metric spaces and applications

*Volume 09, Issue 04 , Autumn 2020, , Pages 253-266*

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**Abstract **

Our aim is to present some common fixed point theorems in bipolar metric spaces via certain contractive conditions. Some examples have been provided to illustrate the effectiveness of new results. At the end, we give two applications dealing with homotopy theory and integral equations.
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##### 3. Some improvements of numerical radius inequalities via Specht’s ratio

*Volume 09, Issue 03 , Summer 2020, , Pages 221-230*

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**Abstract **

We obtain some inequalities related to the powers of numerical radius inequalities of Hilbert space operators. Some results that employ the Hermite-Hadamard inequality for vectors in normed linear spaces are also obtained. We improve and generalize some inequalities with respect to ...
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##### 4. Approximation of endpoints for multi-valued mappings in metric spaces

*Volume 09, Issue 02 , Spring 2020, , Pages 129-137*

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**Abstract **

In this paper, under some appropriate conditions, we prove some $\Delta$ and strong convergence theorems of endpoints for multi-valued nonexpansive mappings using modified Agarwal-O'Regan-Sahu iterative process in the general setting of 2-uniformly convex hyperbolic spaces. Our results extend and unify ...
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##### 5. Fixed points of generalized $\alpha$-Meir-Keeler type contractions and Meir-Keeler contractions through rational expression in $b$-metric-like spaces

*Volume 09, Issue 01 , Winter 2020, , Pages 17-34*

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**Abstract **

In this paper, we first introduce some types of generalized $\alpha$-Meir-Keeler contractions in $b$-metric-like spaces and then we establish some fixed point results for these types of contractions. Also, we present a new fixed point theorem for a Meir-Keeler contraction through rational expression. ...
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##### 6. Hyers–Ulam–Rassias stability of impulsive Volterra integral equation via a fixed point approach

*Volume 08, Issue 04 , Autumn 2019, , Pages 219-227*

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**Abstract **

In this paper, we establish the Hyers--Ulam--Rassias stability and the Hyers--Ulam stability of impulsive Volterra integral equation by using a fixed point method.
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##### 7. New iteration process for approximating fixed points in Banach spaces

*Volume 08, Issue 04 , Autumn 2019, , Pages 237-250*

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**Abstract **

The object of this paper is to present a new iteration process. We will show that our process is faster than the known recent iterative schemes. We discuss stability results of our iteration and prove some results in the context of uniformly convex Banach space for Suzuki generalized ...
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##### 8. 2n-Weak module amenability of semigroup algebras

*Volume 08, Issue 03 , Summer 2019, , Pages 203-209*

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**Abstract **

Let $S$ be an inverse semigroup with the set of idempotents $E$. We prove that the semigroup algebra $\ell^{1}(S)$ is always $2n$-weakly module amenable as an $\ell^{1}(E)$-module, for any $n\in \mathbb{N}$, where $E$ acts on $S$ trivially ...
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##### 9. Operator frame for $End_{\mathcal{A}}^{\ast}(\mathcal{H})$

*Volume 08, Issue 02 , Spring 2019, , Pages 85-95*

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**Abstract **

Frames generalize orthonormal bases and allow representation of all the elements of the space. Frames play significant role in signal and image processing, which leads to many applications in informatics, engineering, medicine, and probability. ...
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##### 10. Best proximity point theorems in 1/2−modular metric spaces

*Volume 08, Issue 02 , Spring 2019, , Pages 145-158*

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**Abstract **

In this paper, first we introduce the notion of $\frac{1}{2}$-modular metric spaces and weak $(\alpha,\Theta)$-$\omega$-contractions in this spaces and we establish some results of best proximity points. Finally, as consequences of these theorems, we derive ...
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##### 11. *-frames in Hilbert modules over pro-C*-algebras

*Volume 08, Issue 01 , Winter 2019, , Pages 1-10*

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**Abstract **

In this paper, by using the sequence of multipliers, we introduce frames with algebraic bounds in Hilbert pro-$ C^* $-modules. We investigate the relations between frames and $ \ast $-frames. Some properties of $ \ast $-frames in Hilbert pro-$ C^* $-modules ...
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##### 12. System of AQC functional equations in non-Archimedean normed spaces

*Volume 08, Issue 01 , Winter 2019, , Pages 41-52*

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**Abstract **

In 1897, Hensel introduced a normed space which does not have the Archimedean property. During the last three decades theory of non--Archimedean spaces has gained the interest of physicists for their research in particular in problems ...
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##### 13. A new type of Hyers-Ulam-Rassias stability for Drygas functional equation

*Volume 07, Issue 04 , Autumn 2018, , Pages 251-260*

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**Abstract **

In this paper, we prove the generalized Hyers-Ulam-Rassias stability for the Drygas functional equation$$f(x+y)+f(x-y)=2f(x)+f(y)+f(-y)$$ in Banach spaces by using the Brz\c{d}ek's fixed point theorem. Moreover, we give a general result on the hyperstability of this equation. Our results are improvements ...
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##### 14. A note on spectral mapping theorem

*Volume 07, Issue 04 , Autumn 2018, , Pages 269-272*

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**Abstract **

This paper aims to present the well-known spectral mapping theorem for multi-variable functions.
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##### 15. On a new type of stability of a radical cubic functional equation related to Jensen mapping

*Volume 07, Issue 04 , Autumn 2018, , Pages 281-292*

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**Abstract **

The aim of this paper is to introduce and solve the radical cubic functional equation $f\left(\sqrt[3]{x^{3}+y^{3}}\right)+f\left(\sqrt[3]{x^{3}-y^{3}}\right)=2f(x)$. We also investigate some stability and hyperstability results for the ...
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##### 16. $\ast$-K-g-Frames in Hilbert $\mathcal{A}$-modules

*Volume 07, Issue 01 , Winter 2018, , Pages 63-71*

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**Abstract **

In this paper, we introduce the concepts of $\ast$-K-g-Frames in Hilbert $\mathcal{A}$-modules and we establish some results.
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##### 17. Corrigendum to "On $(\sigma, \tau)$-module extension Banach algebras"

*Volume 07, Issue 01 , Winter 2018, , Pages 73-74*

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**Abstract **

In this corrigendum, we give a correction of one result in reference [1].
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##### 18. Classical Wavelet Transforms over Finite Fields

*Volume 04, Issue 04 , Autumn 2015, , Pages 241-257*

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**Abstract **

This article introduces a systematic study for computational aspects of classical wavelet transforms over finite fields using tools from computational harmonic analysis and also theoretical linear algebra. We present a concrete formulation for the Frobenius norm of the classical wavelet transforms over ...
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##### 19. Duals and approximate duals of g-frames in Hilbert spaces

*Volume 04, Issue 04 , Autumn 2015, , Pages 259-265*

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**Abstract **

In this paper we get some results and applications for duals and approximate duals of g-frames in Hilbert spaces. In particular, we consider the stability of duals and approximate duals under bounded operators and we study duals and approximate duals of g-frames in the direct sum of Hilbert spaces. We ...
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##### 20. New characterizations of fusion bases and Riesz fusion bases in Hilbert spaces

*Volume 04, Issue 02 , Spring 2015, , Pages 131-142*

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**Abstract **

In this paper we investigate a new notion of bases in Hilbert spaces and similar to fusion frame theory we introduce fusion bases theory in Hilbert spaces. We also introduce a new denition of fusion dual sequence associated with a fusion basis and show that the operators of a fusion dual ...
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##### 21. Upper and lower $\alpha(\mu_{X},\mu_{Y})$-continuous multifunctions

*Volume 04, Issue 01 , Winter 2015, , Pages 1-9*

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**Abstract **

In this paper, a new class of multifunctions, called generalized $\alpha(\mu_{X},\mu_{Y})$-continuous multifunctions, has been dened and studied. Some characterizations and several properties concerning generalized $\alpha(\mu_{X},\mu_{Y})$-continuous multifunctions are obtained. The relationships ...
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##### 22. Frames for compressed sensing using coherence

*Volume 04, Issue 01 , Winter 2015, , Pages 25-34*

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**Abstract **

We give some new results on sparse signal recovery in the presence of noise, for weighted spaces. Traditionally, were used dictionaries that have the norm equal to 1, but, for random dictionaries this condition is rarely satised. Moreover, we give better estimations then the ones given ...
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##### 23. The solutions to some operator equations in Hilbert $C^*$-module

*Volume 04, Issue 01 , Winter 2015, , Pages 35-42*

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**Abstract **

In this paper, we state some results on product of operators with closed ranges and we solve the operator equation $TXS^*-SX^*T^*= A$ in the general setting of the adjointable operators between Hilbert $C^*$-modules, when $TS = 1$. Furthermore, by using some block operator matrix techniques, ...
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##### 24. Numerical solution of Fredholm integral-differential equations on unbounded domain

*Volume 04, Issue 01 , Winter 2015, , Pages 43-52*

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**Abstract **

In this study, a new and efficient approach is presented for numerical solution of Fredholm integro-differential equations (FIDEs) of the second kind on unbounded domain with degenerate kernel based on operational matrices with respect to generalized Laguerre polynomials(GLPs). Properties ...
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##### 25. On duality of modular G-Riesz bases and G-Riesz bases in Hilbert C*-modules

*Volume 04, Issue 01 , Winter 2015, , Pages 53-63*