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The flea on the Magnetic Elephant. [PDF]

Lett Math Phys
Exner P, Morin L.
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The order of approximation by positive linear operators

The order of approximation by positive linear operators
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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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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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