Approximation relative to an ultra function
Tulsi Dass Narang (1986)
Archivum Mathematicum
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Tulsi Dass Narang (1986)
Archivum Mathematicum
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T. W. Narang, Sahil Gupta (2015)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica
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As a counterpart to best approximation, the concept of best coapproximation was introduced in normed linear spaces by C. Franchetti and M. Furi in 1972. Subsequently, this study was taken up by many researchers. In this paper, we discuss some results on the existence and uniqueness of best approximation and best coapproximation when the underlying spaces are metric linear spaces.
T.D. Narang, Sahil Gupta (2015)
Annales UMCS, Mathematica
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As a counterpart to best approximation, the concept of best coapproximation was introduced in normed linear spaces by C. Franchetti and M. Furi in 1972. Subsequently, this study was taken up by many researchers. In this paper, we discuss some results on the existence and uniqueness of best approximation and best coapproximation when the underlying spaces are metric linear spaces
Vugar E. Ismailov (2007)
Studia Mathematica
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The approximation in the uniform norm of a continuous function f(x) = f(x₁,...,xₙ) by continuous sums g₁(h₁(x)) + g₂(h₂(x)), where the functions h₁ and h₂ are fixed, is considered. A Chebyshev type criterion for best approximation is established in terms of paths with respect to the functions h₁ and h₂.
Manuel Fernández, María L. Soriano (1995)
Extracta Mathematicae
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A. O. Chiacchio, J. B. Prolla, M. S. M. Roversi (1992)
Revista Matemática de la Universidad Complutense de Madrid
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Ivan Ginchev, Armin Hoffmann (2002)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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Narang, T.D. (1992)
Publications de l'Institut Mathématique. Nouvelle Série
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Tiziana Cardinali (2002)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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If f is a continuous seminorm, we prove two f-best approximation theorems for functions Φ not necessarily continuous as a consequence of our version of Glebov's fixed point theorem. Moreover, we obtain another fixed point theorem that improves a recent result of [4]. In the last section, we study continuity-type properties of set valued parametric projections and our results improve recent theorems due to Mabizela [11].
Fernando Cobos (1988)
Colloquium Mathematicae
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Sýkorová, Irena
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Several years ago, we discussed the problem of approximation polynomials with Milan Práger. This paper is a natural continuation of the work we collaborated on. An important part of numerical analysis is the problem of finding an approximation of a given function. This problem can be solved in many ways. The aim of this paper is to show how interpolation can be combined with the Chebyshev approximation.