Volume 5 (2023)
Volume 4 (2022)
Volume 3 (2021)
Volume 2 (2020)
Volume 1 (2019)
Number of Articles: 87
Generalized Ulam-Hyers stability of an alternate additive-quadratic-quartic functional equation in fuzzy Banach spaces
Volume 3, Issue 1 , February 2021, , Pages 13-31
Abstract
In this paper, we obtain and establish the generalized Ulam-Hyers stability of an additive-quadratic-quartic functional equation in fuzzy Banach spaces. Read MoreOn a nonlinear abstract second-order integrodifferential equation part I
Volume 3, Issue 4 , December 2021, , Pages 13-24
Abstract
The object of this paper is to study the existence, uniqueness and continuation of the solutions of nonlinear second-order integrodifferential equations. In the theory of infinitesimal ... Read MoreAnti complex fuzzy Lie subalgebras under $S$-norms
Volume 4, Issue 4 , December 2022, , Pages 13-26
Abstract
The objectives of this article are to present the notions of anti complex fuzzy subalgebras and anti complex fuzzy ideals of Lie algebras under $S$-norms and we prove that the ... Read MoreOn character amenability of weighted convolution algebras on certain semigroups
Volume 3, Issue 2 , June 2021, , Pages 15-26
Abstract
In this work, we study the character amenability of weighted convolution algebras $\ell^{1} (S,\omega)$, where $ S $ is a semigroup of classes of inverse semigroups with a uniformly ... Read MoreThe generalized Hyers–Ulam stability of derivations in non-Archimedean Banach algebras
Volume 2, Issue 1 , April 2020, , Pages 17-22
Abstract
In this paper, the generalized Hyers-Ulam stability of the functional inequality||f(a)+f(b)+cf(d)+f(c)d||≤||kf((a+b+cd)/k)||, |k|<|2|,in non-Archimedean ... Read Moret-norms over fuzzy ideals (implicative, positive implicative) of BCK-algebras
Volume 4, Issue 2 , April 2022, , Pages 17-34
Abstract
In this paper, we use the notion of t-norms to introduce fuzzy subalgebras, fuzzy ideals, fuzzy implicative ideals, fuzzy positive implicative ideals in BCK-algebras. Next, we clarify ... Read MoreIntuitionistic fuzzy BCI-algebras (implicative ideals, closed implicative ideals, commutative ideals) under norms
Volume 4, Issue 3 , June 2022, , Pages 17-34
Abstract
In this article, by using norms($T$ and $C$), we present the concept of intuitionistic fuzzy implicative ideals, intuitionistic fuzzy closed implicative ideals and intuitionistic ... Read MoreCharacterization of uniformly asymptotic S-Toeplitz and S-Hankel operators
Volume 5, Issue 2 , July 2023, , Pages 17-28
Abstract
In this paper, we show that a shift operator on a separable Hilbert space with infinite multiplicity is strongly approximated by shift operators with finite multiplicities. Moreover, ... Read MoreLocally finite inverse semigroups
Volume 2, Issue 1 , April 2020, , Pages 23-27
Abstract
In this article, we study locally finite inverse semigroup S and characterize the structure of idempotents of S which are either a well-ordered countable chain or union of ... Read Moren-projective modules in n-abelian category
Volume 5, Issue 3 , September 2023, , Pages 23-33
Abstract
In this paper, we introduce and clarify a new presentation between the n-exact sequence and the n-projective module. Also, we obtain some new results about them Read MoreNumerical solution of a coupled system of fractional order integro differential equations by an efficient numerical method based on the second kind Chebyshev polynomials
Volume 3, Issue 4 , December 2021, , Pages 25-40
Abstract
In this paper, an efficient numerical method based on operational matrices of the second kind Chebyshev polynomials is used for the solution of a coupled system of fractional-order ... Read MoreOn the zeros and critical points of a polynomial
Volume 4, Issue 1 , January 2022, , Pages 25-28
Abstract
Let $P(z)=a_0 + a_1z + \dots + a_{n-1}z^{n-1}+z^n$ be a polynomial of degree $n.$ The Gauss-Lucas Theorem asserts that the zeros of the derivative $P^\prime (z)= a_1 + \dots ... Read MoreFixed point results for generalized contractions in S-metric spaces
Volume 3, Issue 2 , June 2021, , Pages 27-39
Abstract
In this paper, we discuss the existence of a fixed point for a generalized contraction in S-metric spaces. We furnish some examples in support of our main results. Our results generalize ... Read MoreA new version of the Hahn Banach theorem in b-Banach spaces
Volume 3, Issue 3 , September 2021, , Pages 27-32
Abstract
In this paper, we introduce the notion of b-Banach spaces and we present some examples. Also, we give an important extension of the Hahn-Banach theorem in a $b$-Banach space with an ... Read MoreQuasi fixed points of contractions on semi cone metric spaces
Volume 4, Issue 4 , December 2022, , Pages 27-37
Abstract
In this article, the concept of semi-metric spaces is extended to semi-cone metric spaces. Also, some theorems for quasi-fixed points of Banach contractions, Kannan's contractions, ... Read MoreCertain dense subalgebras of continuous vector-valued operator algebras
Volume 2, Issue 1 , April 2020, , Pages 28-34
Abstract
Let X be a compact metric space with at least two elements, B be a unital commutative Banach algebra over the scalar field F=R or C, and α in R with 0<α≤1. Suppose ... Read MoreBicomplex valued bipolar metric spaces and fixed point theorems
Volume 4, Issue 1 , January 2022, , Pages 29-43
Abstract
The concept of bicomplex valued bipolar metric space is introduced in this article, and some properties are derived. Also, some fixed point results of contravariant maps satisfying ... Read MoreEvaluation of integrals and series with uncommon methods
Volume 5, Issue 2 , July 2023, , Pages 29-38
Abstract
Definite integrals and series are calculated using uncommon methods: Feynman's parametrization, Schwinger's representation, and Cauchy's complex integration for series. Read MoreSome results on disjointness preserving Fredholm operators between certain Banach function algebras
Volume 3, Issue 1 , February 2021, , Pages 32-39
Abstract
For two algebras $\A$ and $\B$, a linear map $T : \A \lo \B$ is disjointness preserving if $x \cdot y = 0$ implies $Tx \cdot Ty = 0$ for all $x, y \in \A$ and is said ... Read MoreOn Palais method in b-metric like spaces
Volume 3, Issue 3 , September 2021, , Pages 33-38
Abstract
This paper aims to prove that the Lipschitz constant in the Banach contraction principle belongs to the whole interval [0, 1) for all the six classes of spaces viz. metric spaces, b-metric ... Read Moret-norms over complex fuzzy subgroups
Volume 5, Issue 1 , March 2023, , Pages 33-49
Abstract
In this paper, by using t-norms, we define complex fuzzy subgroups and normal complex fuzzy subgroups and investigate some of their characteristics of them. Later we introduce and study ... Read MoreA new notion of affine sets
Volume 2, Issue 1 , April 2020, , Pages 35-42
Abstract
In this paper, we investigate the behaviour of e-convex sets and e-affine sets. Moreover, some notions like S(e,a,ρ,α) and e-affine cones are introduced and discussed. We ... Read MoreExact controllability and continuous dependence of solution of a conformable fractional control system
Volume 4, Issue 2 , April 2022, , Pages 35-46
Abstract
The exact controllability of a conformable fractional differential system is established in this paper. The system is described by a non-densely defined linear part satisfying the Hille ... Read MoreExtension of the double Newton's method Convergence Order via the Bi-variate power series weight function for Solving Nonlinear Models.
Volume 4, Issue 3 , June 2022, , Pages 35-46
Abstract
This manuscript put forward one and two-parameter families of modified double Newton iterative structure with convergence order six, for approximation of the solution of nonlinear model. ... Read MoreA survey on $\Theta$-contractions and fixed point theorems
Volume 5, Issue 3 , September 2023, , Pages 35-67