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Journal of Computational and Applied Mathematics
Article
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Journal of Computational and Applied Mathematics
Article . 1996
License: Elsevier Non-Commercial
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Journal of Computational and Applied Mathematics
Article . 1996 . Peer-reviewed
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Article . 1996
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The sign regularity of the auxiliary family gi(x) = xαi(−ln x)βi in convergence acceleration processes using the E-algorithm

The sign regularity of the auxiliary family \(g_ i(x) = x^{\alpha_ i}(-\ln x)^{\beta_ i}\) in convergence acceleration processes using the E-algorithm
Authors: Graça, Mário M.;

The sign regularity of the auxiliary family gi(x) = xαi(−ln x)βi in convergence acceleration processes using the E-algorithm

Abstract

In the following \(N\geq 0\) is an integer, \(g(x|\tau)\) \((0\leq \tau\leq N)\) are suitable real valued functions of the real variable \(x, {\mathcal D}\) is \(d/dx\) and, with \(0\leq n\leq N\), the Wronskian \(W(x,g |n)\) is the determinant of the matrix whose \((\tau+1)^{\text{th}}\) row and \((\upsilon+1)^{\text{th}}\) column element is \({\mathcal D}^\upsilon g(x |\tau)\) \((0\leq \tau, \upsilon\leq n)\). It is shown that \(W\) may be constructed by use of a recursive process involving functions \(f(x,k|\tau)\) \((0\leq k\leq N,\;0\leq \tau\leq N-k)\) in which initially \(f(x,0 |\tau)=g(x |\tau)\) \((0\leq\tau\leq N)\) and thereafter \[ f\bigl(x,k+1 |\tau\bigr) = {\mathcal D} \biggl\{ f\bigl (x,k |\tau+1\bigr)/f \bigl(x,k |0 \bigr) \biggr\} \] \((0\leq k

Keywords

Sign regularity, Numerical solution of boundary value problems involving ordinary differential equations, Extrapolation to the limit, deferred corrections, error expansion, Applied Mathematics, E-algorithm, \(E\)-algorithm, Wronski-determinant, Numerical computation of determinants, Computational Mathematics, Error expansion, Matrices over function rings in one or more variables, sign regularity, Convergence acceleration, convergence acceleration

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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!
0
Average
Average
Average
hybrid