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107 research outcomes, page 1 of 11
  • publication . Article . 2017
    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

  • publication . Article . 2017
    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...

  • publication . Article . 2017
    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

  • publication . Article . 2018
    Open Access English
    Authors:
    Zanyar A. Ameen; Baravan A. Asaad;
    Publisher: Refaad

    Recently, new types of (open) sets have been studied by some topologists. This note shows that these sets are identical to some other sets already exist in the literature.

  • publication . Article . 2017
    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...

  • publication . Article . 2017
    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...

  • publication . Article . 2017
    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:
    Hariwan Z. Ibrahim;
    Publisher: Refaad

    In this paper, we begin the study of β-α-continuous multiplication map. Here we begin by stating some properties of β-α-continuous multiplication and define the β-α-continuity of the inversion map as well. We then introduce the concept of β-α-topological groups and we go...

  • publication . Article . 2018
    Open Access English
    Authors:
    LAIB Teldja; Ayadi abdelhamid;
    Publisher: Refaad

    The purpose of this article is, firstly, to modify the old definition of the sentinel, introduced by J.L. Lions, so that we can separate the control support to the observation support and, secondly, to identify the pollution terms which arise in regular problems which a...

  • publication . Article . 2020
    Open Access English
    Authors:
    Chenar Abdul Kareem Ahmed;
    Publisher: Refaad

    The concept of central RM rings is introduced in this paper as a generalization of RM rings. Since every RM ring is central RM we study the sufficient condition for a central RM ring to be a RM one. It is shown that every central reversible and hence every central symme...

107 research outcomes, page 1 of 11