Results 241 to 250 of about 315,257 (270)

On the approximation of positive operators and the behaviour of the spectra of the approximants

Integral Equations and Operator Theory, 1997
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Räbiger, Frank, Wolff, Manfred P. H.
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Strong Approximation of Functions by Positive Operators

Journal of Mathematical Sciences, 2016
The paper is concerned with approximation of continuous functions, defined on the real axis, by positive linear operators of integral type and by generalized Bernstein operators. Quantitative results, expressed in terms of moduli of continuity, are obtained. Some results of \textit{V. Zhu} and \textit{G. Natanson} [Uch. Zap. Tartu. Gos. Univ.
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Approximation of Unbounded Functions by Linear Positive Operators

Mathematische Nachrichten, 1996
AbstractA unified class of linear positive operators has been defined. Using these operators some approximation estimates have been obtained for unbounded functions. For particular linear positive operators these results sharpen and improve the earlier estimates due to Fuhua Cheng (J. Approx. Theory, 1984) and Xiehua Sun (J. Approx. Theory, 1988).
Kasana, H. S., Sollervall, H.
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On the Approximation by Linear Positive Operators

1970
This paper is concerned with some properties of linear positive operators which are in analogy with the well-known Bernstein operator. Let ℑ j (I j ), j = 1,2, denote two linear spaces of real functions defined on the sets I j , j = 1,2, of points of the real axis. Let L n :ℑ 1 (I 1 ) →ℑ 2 (I 2 ), n = 1,2,..., be a sequence of linear positive operators
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Simultaneous Interpolation and Approximation by a Class of Multivariate Positive Operators

Numerical Algorithms, 2003
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Approximation by Positive Sublinear Operators

2018
Here we study the approximation of functions by positive sublinear operators under differentiability. We produce general Jackson type inequalities under initial conditions. We apply these to a series of well-known Max-product operators. So our approach is quantitative by producing inequalities with their right hand sides involving the modulus of ...
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Statistical Approximation of Positive Linear Operators

2014
In this chapter, we present some Korovkin-type approximation theorems for functions of two variables via statistical convergence, A-statistical convergence, and statistical A-summability. We also study rates of A-statistical convergence of a double sequence of positive linear operators.
M. Mursaleen, S. A. Mohiuddine
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On Ritz Approximations for Positive Definite Operators [PDF]

, 2003
We present new bounds for the eigenvalues and eigenvectors of positive definite operators. An algorithm for the computation of rigorous bounds for finite- element approximations is outlined. An accuracy of these approximations is assessed on several model examples and compared with the existing bounds found in the literature.
openaire  

Connections between the Approximation Orders of Positive Linear Operators and Their Max-Product Counterparts

Numerical Functional Analysis and Optimization, 2021
Lucian Coroianu, Danilo Costarelli, Sorin G Gal   +2 more
exaly  

Poisson approximation to the binomial distribution: extensions to the convergence of positive operators

Revista De La Real Academia De Ciencias Exactas, Fisicas Y Naturales - Serie A: Matematicas, 2023
Margareta Heilmann, Ioan Rasa
exaly