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Article
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SIAM Journal on Numerical Analysis
Article . 1976 . Peer-reviewed
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Characterizations of Best Complex Chebyshev Approximate Solutions of $Av = b$

Characterizations of best complex Chebyshev approximate solutions of Av = b
Authors: Borowsky, Michael S.;

Characterizations of Best Complex Chebyshev Approximate Solutions of $Av = b$

Abstract

Let $Av = b$ be an overdetermined system of m complex equations in n unknowns with rank $(A) = k$ and $m \geqq 2k + 1$. It is shown that if $x_\infty $ is a Chebyshev solution of $Av = b$, then $x_\infty $ is also a Chebyshev solution of a $2k + 1 \times n$ subsystem of $Av = b,A_{2k + 1} v = b_{2k + 1} $. Furthermore, $\| {b - Ax_\infty } \|_\infty = \| {b_{2k + 1} - A_{2k + 1} x_\infty } \|_\infty $.Finally if $(\| \cdot \|_n )$ is a sequence of norms with the property that for each a in $C^n ,\| a \|_\infty \leqq \| a \|_n $ and $\lim _{n \to \infty } \| a \|_n = \| a \|_\infty $, it is shown that a sequence of best $\| \cdot \|_n $-approximate solutions of the overdetermined system of equations $Av = b$ converges to a best $\| \cdot \|_\infty $-approximate solution called the strict approximation.

Keywords

Numerical solutions to overdetermined systems, pseudoinverses, Theory of matrix inversion and generalized inverses

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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).
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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.
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