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Latest Issue

Volume 12, No. 2, June 2019




On Farthest Points in Fuzzy Normed Spaces

The main purpose of this paper is to find t-farthest points in fuzzy
normed spaces. We introduce the concept of t-remotest fuzzy sets and give some interesting theorems. In particular, we study the set of all

t-farthest points to an element from a set and discuss some properties of the this set.


M. Ahmadi. Baseri

H. Mazaheri


JJMS, 2019, 12(2),103-114

Algebraic Properties of λ-Fuzzy Subgroups

In this paper, we initiate the study of λ-fuzzy sets. We define the notion of λ-fuzzy subgroup and prove that every fuzzy subgroup is λ-fuzzy subgroup.
We introduce the notion of λ-fuzzy cosets and establish their algebraic properties.
We also initiate the study of λ-fuzzy normal subgroups and quotient group with respect to λ-fuzzy normal subgroup and prove some of their various group theoretic properties. We also investigate effect on the image and inverse image of λ-fuzzy subgroup (normal subgroup) under group homomorphism and establish an isomorphism between the quotient group with respect to λ-fuzzy normal subgroup and quotient group with respect to the normal subgroup G pλ.



Umer Shuaib

Waseem Asghar


JJMS, 2019, 12(2),115-134

Generalized Fuzzy Slacks-Based Measures of Efficiency and its Applications

Data envelopment analysis (DEA) is a mathematical approach for evaluating the efficiency of decision making units (DMUs). Additionally, slacks-based measures (SBM) of efficiency are used for direct assessment of efficiency in the presence of imprecise data with slack values. Traditional DEA models assume that all input and output data are known exactly. In many situations, however, some inputs and/or outputs take fuzzy data. Fuzzy DEA (FDEA) models emerge as another class of DEA models ...................



Ali Ashrafi
Mozhgan Mansouri Kaleibar


JJMS, 2019, 12(2),135-149

Complex Fuzzy and Generalized Complex Fuzzy Subpolygroups of a Polygroup

The objective of this paper is to combine the innovative concept of
complex fuzzy sets and polygroups. We introduce the concepts of complex fuzzy subpolyrgroups and generalized complex fuzzy subpolyrgroups of a polygroup. We provide some examples and properties of them.



M. Al Tahan
B. Davvaz


JJMS, 2019, 12(2),151-173

On the Dual of Weakly Prime and Semiprime Modules

The weakly second modules (the dual of weakly prime modules) was introduced in [6]. In this paper we introduce and study the semisecond and strongly second modules. Let R be a ring and M be an R-module. We show that M is semisecond if and only if MI = MI2 for any ideal I of R. It is shown that every sum of the second submodules of M is a semisecond submodule of M. Also if M is an Artinian module, then M has only a finite number of maximal semisecond submodules. We prove that every strongly ...................


R. Beyranvand


JJMS, 2019, 12(2),175-190

Weighted Estimates for Two Kinds of Toeplitz Operators

In this paper, we establish the boundedness of a class of Toeplitz operators related to strongly singular Calderon-Zygmund operators and weighted BMO functions on weighted Morrey spaces. Moreover, the boundedness of another kind of Toeplitz operators related to strongly singular Calderon-Zygmund operators and weighted Lipschitz functions on weighted Morrey spaces is also obtained.


Zhe Cui

Yan Lin


JJMS, 2019, 12(2),191-209

Compact Composition Operators on Model Spaces with Univalent Symbols

We give a sufficient condition and a necessary condition for the compactness of the composition operators on model spaces Cφ : Kθ → H2, where φ is univalent. This is a generalization to a result of Shapiro for the composition operator Cφ : H2 → H2, [11].


Muath Karaki



JJMS, 2019, 12(2),211-217


Some Hermite-Hadamard Type Inequaliyies for Functions whose Derivatives are Quasi-Convex

In this paper, we establish new Hermite-Hadamard's inequalities using a new identity for parameter functions via quasi-convexity. Several known results are derived. Applications to special means are also given.


B. Meftah

M. Merad

A. Souahi


JJMS, 2019, 12(2),219-231


Restricted Hom-Lie Superalgebras


The aim of this paper is to introduce the notion of restricted Hom-Lie
superalgebras. This class of algebras is a generalization of both restricted Hom-Lie algebras and restricted Lie superalgebras. In this paper, we present a way to obtain restricted Hom-Lie superalgebras from the classical restricted Lie superalgebras along with algebra endomorphisms. Homomorphisms relations between restricted Hom-Lie superalgebras are defined and studied. Also, we obtain some properties of p-maps and restrictable Hom-Lie superalgebras.


Shadi Shaqaqha


JJMS, 2019, 12(2),233-252


A Zero-Truncated Poisson-Aradhana Distribution with Applications

In this paper, a zero-truncation of Poisson-Aradhana distribution proposed by Shanker (2017) named ‘zero-truncated Poisson-Aradhana distribution’ has been introduced and investigated. A general expression for the r th factorial moment about origin has been obtained and thus the first four moments about origin and the central moments have been given. Also, the expressions for coefficient of variation, skewness, kurtosis, and the index of dispersion of the distribution have been presented .............


Rama Shanker

Kamlesh Kumar Shukla


JJMS, 2019, 12(2),253-263