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Now showing items 41-60 of 98

    • On commutativity of prime near-rings with multiplicative generalized derivation 

      Bedir, Zeliha; Gölbaşı, Öznur (Ankara Üniversitesi, 2019-02-01)
      In the present paper, we shall prove that 3-prime near-ring N is commutative ring, if any one of the following conditions are satisfied: (i) f(N)⊆Z, (ii) f([x,y])=0, (iii) f([x,y])=±[x,y], (iv) f([x,y])=±(xoy), (v) ...
    • On Vector-Valued Operator Riesz Sequence Spaces 

      Duyar, Osman; Demiriz, Serkan (Ankara Üniversitesi, 2019-02-01)
      In this paper we introduce vector-valued Riesz sequence spaces R₀^{q}(X), R_{c}^{q}(X), R_{∞}^{q}(X) and R₁^{q}(X) and determine their Köthe-Toeplitz duals. Also, we characterize some matrix classes.
    • A Study on a Partially Null Curve in E₂⁴ 

      İyigün, Esen (Ankara Üniversitesi, 2019-02-01)
      In this paper, we study with Frenet equations which are given in [3] of a partially null curve in Semi- Euclidean 4-space E₂⁴ with index 2. By using the Frenet equations, we give some theorem and corollary. A characterization ...
    • Classical Way of Looking at the Lane-Emden Equation 

      Tanrıverdi, Tanfer (Ankara Üniversitesi, 2019-02-01)
      In this article, the well-known approximate and analytical solutions of the Lane-Emden equation applying Taylor series expansion are derived. To the best of author's knowledge nobody has overcome the singularity of the ...
    • Global behavior of a three-dimensional system of difference equations of order three 

      Tollu, Durhasan Turgut; Yalçınkaya, İbrahim (Ankara Üniversitesi, 2019-02-01)
      In this paper, we investigate the global behavior of the positive solutions of the system of difference equations u_{n+1}=((α₁u_{n-1})/(β₁+γ₁v_{n-2}^{p})), v_{n+1}=((α₂v_{n-1})/(β₂+γ₂w_{n-2}^{q})), w_{n+1}=((α₃w_{n-1 ...
    • Flat Strong δ-covers of Modules 

      Demirci, Yılmaz Mehmet (Ankara Üniversitesi, 2019-02-01)
      We say that a ring R is right generalized δ-semiperfect if every simple right R-module is an epimorphic image of a flat right R-module with δ-small kernel. This definition gives a generalization of both right δ-semiperfect ...
    • Coefficient estimates for bi-concave functions 

      Sakar, F. Müge; Güney, H. Özlem (Ankara Üniversitesi, 2019-02-01)
      In this study,a new class C_{Σ}^{p,q}(α) of analytic and bi-concave functions were presented in the open unit disc. The coefficients estimates on the first two Taylor-Maclaurin coefficients |a₂| and |a₃| were found for ...
    • Generalization of (α-F_{d})--contraction on quasi--metric space 

      Acar, Özlem (Ankara Üniversitesi, 2019-02-01)
      In this paper, we introduce the concept of generalized (α-F_{d})-contraction and give some fixed point results in quasi metric spaces with different types of completeness.
    • k-autocorrelation and its applications 

      Özimamoğlu, Hayrullah; Şahin, Murat; Ölmez, Oktay (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The standard autocorrelation measures similarities between a binary sequence and its any shifted form. In this paper, we introduce the concept of the k-autocorrelation of a binary sequence as a generalization of the standard ...
    • Eigenvalues and scattering properties of difference operators with impulsive condition 

      Erdal, İbrahim; Yardımcı, Şeyhmus (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this work, we are concerned with difference operator of second order with impulsive condition. By the help of a transfer matrix M, we present scattering function of corresponding operator and examine the spectral ...
    • Some Geometric Characterizations of a Fractional Banach Set 

      Özger, Faruk (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      This paper is devoted to investigate the modular structure of a fractional Banach set of sequences and prove that this set is reflexive and convex and it possesses uniform Opial, (β), (L) and (H) properties. The convexity ...
    • Best bound for λ- pseudo starlike functions 

      KRİSHNA, D. Vamshee; SHALİNİ, D. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we obtain sharp upper bound to the second Hankel determinant for the functions belong to the class of λ- pseudo starlike functions, an interesting sub class of univalent functions defined in the open unit ...
    • The Minkowski's inequalities utilizing newly defined generalized fractional integral operators 

      Usta, Fuat; Budak, Hüseyin; Ertugral, Fatma; Sarıkaya, Mehmet Zeki (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Motivated by the recent generalized fractional integral operators proposed by Tunc et. al. <cite>tunc</cite>, we establish a generalization of the reverse Minkowski's inequalities. Within this context, we provide new upper ...
    • On a new variation of injective modules 

      Türkmen, Ergül; Türkmen, Burcu Nişancı; Pancar, Ali; Nebiyev, Celil (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we provide various properties of GE and GEE-modules, a new variation of injective modules. We call M a GE-module if it has a g-supplement in every extension N and, we call also M a GEE-module if it has ample ...
    • On the spectrum and Hilbert Schimidt properties of generalized Rhaly matrices 

      MURSALEEN, Mohammad; YİLDİRİM, Mustafa; DURNA, Nuh (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we show that the multiplications of some generalized Rhaly operators are Hilbert Schimidt operators.We also calculate the spectrum and essential spectrum of a special generalized Rhaly matrices on the Hardy ...
    • A data science study for determining food quality: an application to wine 

      Özalp, Ata Emre; Askerzade, İman (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, wine quality is investigated based on physicochemical ingredients which include fixed acidity, volatile acidity, citric acid, residual sugar, chloride, free sulfur dioxide, total sulfur dioxide, density, pH, ...
    • Intersection graphs of co-ideals of semirings 

      Atani, S. Ebrahimi; PİSHHESARİ, Saboura Dolati; KHORAMDEl, Mehdi; Zahra Ebrahimi SARVANDİ, Zahra Ebrahimi (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Let R be a semiring with identity. In this paper, we introduce the intersection graph of co-ideals, denoted by G(R). The vertices of G(R) are non-trivial co-ideals of R, and two distinct vertices I and J are adjacent if ...
    • On the linear codes over the ring Z₄+v₁Z₄+...+v_{t}Z₄ 

      Dertli, Abdullah; Cengellenmiş, Yasemin (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Some results on linear codes over the ring Z₄+uZ₄+vZ₄,u²=u,v²=v,uv=vu=0 in [6,7] are generalized to the ring D_{t}=Z₄+v₁Z₄+...+v_{t}Z₄,v_{i}²=v_{i},v_{i}v_{j}=v_{j}v_{i}=0 for i≠j,1≤i,j≤t. A Gray map Φ_{t} from D_{t}ⁿ to ...
    • Solutions of the radial Schrödinger equation in hypergeometric and discrete fractional forms 

      Özturk, Ökkes; Yılmazer, Resat (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The purpose of this present paper is to obtain the hypergeometric and discrete fractional solutions of the radial Schrödinger equation by using the nabla discrete fractional calculus operator.
    • On a type of α-cosymplectic manifolds 

      Beyendi, Selahattin; Ayar, Gülhan; Aktan, Nesip (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The object of this paper is to study α-cosymplectic manifolds admitting a W₂-curvature tensor.