Browsing Cilt:68 Sayı:02 (2019) by Issue Date
Now showing items 21-40 of 90
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Global existence and stability results for Hadamard--Volterra--Stieltjes integral equations
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper we prove the existence and stability of solutions of a class of Hadamard--Volterra--Stieltjes integral equations in the Banach space of continuous and bounded functions on unbounded interval. That result is ... -
Weighted standard deviation method for X and S control charts
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)A Shewhart chart based on normality assumption is not appropriate for skewed distributions since its Type-I error rate is inflated. This study presents X and S control charts for monitoring the process variability for ... -
Some generalized Hermite-Hadamard type inequalities by using the harmonic convexity of differentiable mappings
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, a general identity involving a di¤erentiable mapping is established. By using mathematical analysis, Hölder inequality and some auxiliary results, new generalized Hermite Hadamard type inequalities for ... -
On some problems regarding set valued (α,ψ)-F-contractions
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, we introduce set valued (α,ψ) F-contraction mappings in the setting of a partial metric space. We obtain some common fixed point theorems for a pair of these mappings. These results generalize several recent ... -
On the periodicity of the solution of a rational difference equation
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, some cases on the periodicity of the rational difference equation S_{n+1}=S_{n-p}(((aS_{n-q}+bS_{n-r}+cS_{n-s})/(dS_{n-q}+eS_{ n-r}+fS_{n-s}))), are investigated, where a, b, c, d, e, f ∈(0,∞). The ... -
Coefficient bounds for a certain subclass of analytic and bi-univalent functions
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, we introduce and investigate a new subclass of the a-nalytic and bi-univalent functions in the open unit disk in the complex plane. For the functions belonging to this class, we obtain estimates on the first ... -
On subsequentially convergent sequences
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this study we obtain some sufficient conditions under which subsequential convergence of a sequence of real numbers follows from its boundedness. Eventually, we obtain crucial information about the subsequential behavior ... -
On irregular coloring of wheel related graphs
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)An irregular coloring is a proper coloring in which distinct vertices have different color codes. In this paper, we obtain the irregular chromatic number for middle graph, total graph, central graph and line graph of wheel ... -
Fixed point results for Pata contraction on a metric space with a graph and its application
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)Let ( X , d ) be a metric space endowed with a graph G such that the set V ( G ) of vertices of G coincides with X . We define the notion of Pata- G -contraction type maps and obtain some fixed ... -
Supra bT-set connected functions in supra topological spaces
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, we came out with the new approach of functions called bT^{μ}-set connected functions and studied its properties. Also, we have retrieve separation axioms using bT^{μ}-set connected functions in supra topological ... -
Remarks on almost η-Ricci solitons in (ε)-para Sasakian manifolds
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)We consider almost η-Ricci solitons in (ε)-para Sasakian manifolds satisfying certain curvature conditions. In the gradient case we give an estimation for the norm of the Ricci curvature tensor and express the scalar ... -
Schatten-von Neumann characteristic of infinite tridiagonal block operator matrices
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, the boundedness and compactness properties of infinite tridiagonal block operator matrices in the direct sum of Hilbert spaces are studied. The necessary and sufficient conditions for these operators belong ... -
The matrix sequence in terms of bi-periodic Fibonacci numbers
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, we define the bi-periodic Fibonacci matrix sequence that represent bi-periodic Fibonacci numbers. Then, we investigate generating function, Binet formula and summations of bi-periodic Fibonacci matrix sequence. ... -
ω-continuity on generalized neighbourhood systems
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)We introduce ω -weakly- ( g 1 , g 2 ) -continuous functions on generalized topological spaces and study their relations with other classes of generalized continuous functions given in [1,8]. Then, we define ... -
Spherical indicatrices of a Bertrand curve in three dimensional Lie groups
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, new representations of a Bertrand curve pair in three dimensional Lie groups with bi-invariant metric are given. Besides, the spherical indicatrices of a Bertrand curve pair are obtained and the relations ... -
Convergence of solutions of nonautonomous Nicholson's Blowflies model with impulses
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)This paper deals with a nonautonomous Nicholson's blowflies model with impulses. It is shown that under the proper conditions every positive solution of the model approaches to a constant as t tends to infinity. -
Loxodromes on helicoidal surfaces and tubes with variable radius in E⁴
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)In this paper, we generalize the equations of loxodromes on helicoidal surfaces and canal surfaces in E^3 to the case of 4-dimension (E^4). Also we give some examples via Mathematica. -
The dimension of products of n homogeneous components in free lie algebras
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)Let L be a free Lie algebra of finite rank r≥2 over a field F and we let L_{m_{i}} denote the degree m_{i} homogeneous component of L. Ralph Stöhr and Micheal Vaughan-Lee derived formulae for the dimension of the subspaces ... -
A mathematical model of Hepatitis B transmission in Turkey
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)Hepatitis B infection is one of the serious viral infections that is treating the global health. Turkey has an intermediate endemicity for hepatitis B. In this study, a classical SIR model for hepatitis B virus (HBV) ... -
Henneberg's algebraic surfaces in Minkowski 3-space
(Ankara Üniversitesi Fen Fakültesi, 2019-08-01)Bu çalışmada, üç boyutlu Minkowski uzayında Henneberg minimal yüzeyi ele alınmış olup yüzeyin derece, sınıf ve integralden bağımsız gösterinleri verilniştir.
