http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2412 JAEM 2020, Vol 10, No 1 koleksiyonunu içerir. Thu, 09 Apr 2026 04:37:13 GMT 2026-04-09T04:37:13Z http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2814 Approximation of periodic functions by sub-matrix means of their fourier series Krasniqi, Xhevat Zahir Some results on approximation of periodic functions are extended in two directions: Improving the degree of approximation of periodic functions by sub-matrix means of its Fourier series and such degree is applicable for a wider class of summbility matrices in the sense of their entries in which class of sequences belongs to. Wed, 01 Jan 2020 00:00:00 GMT http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2814 2020-01-01T00:00:00Z http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2813 A pre-subadditive fuzzy measure model and its theoretical interpretation Ünver, Mehmet; Özçelik, Gökhan; Olgun, Murat In this paper a particular set function which depends on densities of singletons with interdependence coefficients and which provides redundancy among singletons is considered. The Möbius representation of this function is obtained. Then a necessary and sufficient condition is presented to attain a fuzzy measure from this set function. Wed, 01 Jan 2020 00:00:00 GMT http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2813 2020-01-01T00:00:00Z http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2812 Lucas polynomial solution for neutral differential equations with proportional delays Gümgüm, Sevin; Baykuş Savaşaneril, Nurcan; Kürkçü, Ömür Kıvanç; Sezer, Mehmet This paper proposes a combined operational matrix approach based on Lucas and Taylor polynomials for the solution of neutral type differential equations with proportional delays. The advantage of the proposed method is the ease of its application. The method facilitates the solution of the given problem by reducing it to a matrix equation. Illustrative examples are validated by means of absolute errors. Residual error estimation is presented to improve the solutions. Presented in graphs and tables the results are compared with the existing methods in literature. Wed, 01 Jan 2020 00:00:00 GMT http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2812 2020-01-01T00:00:00Z http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2811 On the Chebyshev polynomial coefficient problem of bi-Bazilevi? functions Altınkaya, Şahsene; Yalçın, Sibel A function said to be bi-Bazilevi? in the open unit disk U if both the function and its inverse are Bazilevi? there. In this paper, we will study a newly constructed class of bi-Bazilevi? functions. Furthermore, we establish Chebyshev polynomial bounds for the coefficients, and get Fekete-Szegö inequality, for the class B(?, t). Wed, 01 Jan 2020 00:00:00 GMT http://belgelik.isikun.edu.tr/xmlui/handleiubelgelik/2811 2020-01-01T00:00:00Z