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60 Research products, page 1 of 6

  • Publications
  • 2017-2021
  • Open Access
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  • General Letters in Mathematics

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  • Open Access English
    Authors: 
    A.A.Azamov;
    Publisher: Refaad

    It is suggested several lower estimations for the determinants of matrices consisting of elements +1 and −1, improving the known Hadamard’s lower estimation

  • Open Access English
    Authors: 
    O. Bazighifan;
    Publisher: Refaad

    This paper is concerned with asymptotic and oscillatory properties of the nonlinear higher-order differential equation with delay argument. Some examples are given to illustrate our main result

  • Open Access English
    Authors: 
    Karwan Hama Faraj Jwamer; Bzhar Jamal;
    Publisher: Refaad

    In this paper, a quadratic B-Spline has been constructed that is an approximate solution to a function with very limited given lacunary data and approximate boundary conditions. Then the error bound for the B-spline is found. Further this construction is used to solve b...

  • Open Access English
    Authors: 
    K.Hilal; Y. Allaoui;
    Publisher: Refaad

    In this work we define the solution of the fractional neutral impulsive differential equation with infinite delay. The results of existence are obtained by using the Banach contraction and Schafer fixed point. Some proprieties of probability density functions and semi-group...

  • Open Access English
    Authors: 
    Nourddin Saidou;
    Publisher: Refaad

    In this paper we will establish a new relationship between differentiability and optimization of convex functions. We consider convex lower semi continuous functions in Banach spaces and we characterize respectively the relation between Fr´echet (Gaˆteaux) differentiabili...

  • Open Access English
    Authors: 
    Md. Yasin Ali; Kanak Ray Chowdhury; Abeda Sultana; Nirmal Kanti Mitra;
    Publisher: Refaad

    In this paper, using “belongingness (∈) ” and quasi-coincidence (q) ” of fuzzy points and" fuzzy sets, the concept of (∈, ∈ ∨q) -fuzzy hemirings and (∈¯, ∈ ∨¯ ¯q) -fuzzy hemirings have been introduced and some of its properties have been investigate

  • Publication . Article . 2019
    Open Access English
    Authors: 
    Shahad T.Almohammadi; Cenap Ozel;
    Publisher: Refaad

    In this article, we will introduce the concept of rough vector spaces using upper approximation, and some algebraic results will be proven. Additionally, this concept will be combined with the concept of topological space.

  • Publication . Article . 2017
    Open Access English
    Authors: 
    A. El Allaoui; Said Melliani; Lalla Saadia Chadli;
    Publisher: Refaad

    In this paper, we generalize the definition of a fuzzy strongly continuous semigroup and its generator. We define a conformable fractional fuzzy semigroups of operators and its generator. We establish some of their properties and some results about this concept.

  • Open Access English
    Authors: 
    Aiman Eid Al-Rawajfeh; Zuhier Altawallbeh;
    Publisher: Refaad

    In this work we formalize new findings on formal Arabic language by constructing equivalence classes on letters depending on inversion principle. This equivalent relation furnishes a conjecture that Arabic language has a DNA-like inversion controller, called language DN...

  • Publication . Article . 2019
    Open Access English
    Authors: 
    Abd El-Monem M. Kozae; E. A. Abo-Tabl;
    Publisher: Refaad

    The topological structure is a more general mathematical model that helps in solving many problems in digital topology and its applications. In this paper, we introduce and study some general forms of separation properties based on operations. The notions of generalized...