Results 11 to 20 of about 53 (44)

FARTHEST POINTS IN HILBERT OPERATOR SPACES WITH APPLICATIONS

, 2015
The purpose of this paper is to Provide conditions for the existence of farthest points of closed and bounded subsets of Hilbert operator spaces. This will done by applying the concept of numerical range. We give, inter alia, some results to characterize
M. Iranmanesh, F. Soleimany
semanticscholar   +1 more source

A General Approximation Approach for the Simultaneous Treatment of Integral and Discrete Operators

Advanced Nonlinear Studies, 2018
In this paper, we give a unitary approach for the simultaneous study of the convergence of discrete and integral operators described by means of a family of linear continuous functionals acting on functions defined on locally compact Hausdorff ...
Vinti Gianluca, Zampogni Luca
doaj   +1 more source

Approximation spaces associated with Legendre differential operators

, 2014
Interpolated scales of approximation spaces and appropriate Bernstein-Jackson inequalities, generated by Legendre differential operators, are considered. Inequalities are applied to spectral approximations of such operators.
M. Dmytryshyn
semanticscholar   +1 more source

Matrix formulation for infinite-rank operators

, 2012
Every finite-rank operator on a linear space X is the composition of an operator from X to a finite dimensional Euclidean space and of an operator from that Euclidean space to X .
B. V. Limaye
semanticscholar   +1 more source

New modification of the Post Widder operators preserving exponential functions

Arab Journal of Basic and Applied Sciences
The current article deals with a modification of the Post-Widder operators which reproduce the exponential functions both [Formula: see text] and [Formula: see text] for [Formula: see text] The central moments, uniform convergence of the operators and ...
Melek Sofyalıoğlu Aksoy
doaj   +1 more source

Note on the shape-preservation of a new class of Kantorovich-type operators via divided differences

Demonstratio Mathematica
Shape-preserving approximation is a significant approximation method that has many application areas, such as computer-based geometric design, image processing, geodesy, chemistry, and robotics.
Turhan Nezihe
doaj   +1 more source

Estimates for Durrmeyer-type exponential sampling series in Mellin-Orlicz spaces

Demonstratio Mathematica
This study examines Durrmeyer-type exponential sampling series to obtain a quantitative estimate by using the concept of the logarithmic modulus of smoothness defined with the help of a suitable modular functional on Mellin-Orlicz spaces.
Kangal Esma, Kantar Ülkü Dinlemez
doaj   +1 more source

Energy wavelet analysis of time series

, 2002
In this paperwe will approach the analysis of time series by the discrete Haar wavelet trasnform and by the energy distribution. it is shown that the wavelet coefficients are strictly related to the scheme of finite differences, thus giving information ...
Ciancio, Armando, Cattani, Carlo
core  

Wavelet estimate of time series

, 2001
In this paper a wavelet technique to study time series by discrete wavelet coefficients, is proposed. Since time series are mainly represented by histograms we will use the Haar waveletes and the Haar wavelet interpolation [1,2].
CATTANI, Carlo, A. Ciancio, Ciancio, Armando   +2 more
core  

Approximation characteristics for diagonal operators in different computational settings

Journal of Approximation Theory, 2006
G. Fang, Lixin Qian
semanticscholar   +1 more source