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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Acta Mathematica Hun...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Acta Mathematica Hungarica
Article . 1991 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
zbMATH Open
Article . 1991
Data sources: zbMATH Open
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Local Lipschitz constants and Kolushov polynomials

Authors: Bartelt, M. W.; Swetits, J. J.;

Local Lipschitz constants and Kolushov polynomials

Abstract

Let \(C[a,b]\) be the space of continuous real-valued functions on \([a,b]\) with uniform norm \(\|\;\|\). For \(f\) in \(C[a,b]\), let \(B_ n(f)\) denote the best uniform approximate from the set of algebraic polynomials of degree \(n\) or less to \(f\). \(E_ n(f)\) is the number of the extremal points of \(f-B_ n(f)\). We define the local Lipschitz constant for \(f\) by \(\lambda^ \ell_ n(f)=\lim_{\delta\to+0}\sup\{\| B_ n(f+\varphi)-B_ n(f)\|/\|\varphi\|;\;0<\|\varphi\|<\delta\}\). Then Angelos, Henry, Kaufman, Kroó and Lenker showed that if \(E_ n(f)=n+2\) for all sufficiently large \(n\), \(\lim^ \lambda_ n(f)=\infty\). The authors study the behavior of \(\lambda^ \ell_ n(f)\) by using Kolushov polynomials. First they characterize \(\lambda^ \ell_ n(f)\) for fixed \(n\) in terms of Kolushov polynomials and second show that \(\lim \lambda^ \ell_ n(f)=\infty\) holds in the more general case.

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Keywords

Approximation by polynomials, local Lipschitz constant, algebraic polynomials, best uniform approximate, Kolushov polynomials

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
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