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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Damien Roy (2008)
Acta Arithmetica
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Stéphane Lozier, Damien Roy (2012)
Acta Arithmetica
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Carlos Benítez, Manuel Fernández, María L. Soriano (1996)
Extracta Mathematicae
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Luo, Xianfa, Wu, Delin, He, Jinsu (2009)
International Journal of Mathematics and Mathematical Sciences
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George Szekeres, Vera T.-Sós (1988)
Acta Arithmetica
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Fernando Cobos (1988)
Colloquium Mathematicae
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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.
N. Hadjisavvas, Nassopoulos B. (1988)
Mathematische Annalen
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