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Journal of Approximation Theory
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Journal of Approximation Theory
Article . 2007
License: Elsevier Non-Commercial
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On recurrence coefficients for rapidly decreasing exponential weights

Authors: Eli Levin; Doron S. Lubinsky;

On recurrence coefficients for rapidly decreasing exponential weights

Abstract

The main problem under consideration in the present paper is the relationship between the rate of convergence of the recurrence coefficients, and the rate of decay of the exponential weight at the endpoints of the orthogonality interval \((a,b)\) (finite or infinite). In particular, for the weight \[ W(x)=\exp \left(-\exp_k(1-x^2)^{-\alpha}\right), \qquad x\in [-1,1], \] where \(\alpha>0\), \(k\) is a positive integer, and \(\exp_k\) denotes the \(k\)th iterated exponential, the authors prove that \[ \tfrac12-a_n=\tfrac14 \left(\log_k n\right)^{-1/\alpha} \left(1+o(1)\right), \qquad n\to\infty, \] where \(\{a_n\}\) are the recurrence coefficients for the orthogonal polynomials \(\{p_n\}\) associated with \(W^2\), and \(\log_k\) denotes the \(k\)th iterated logarithm. More general non-even weights on a non-symmetric interval are also studied.

Keywords

Orthogonal polynomials and functions of hypergeometric type (Jacobi, Laguerre, Hermite, Askey scheme, etc.), Mhaskar-Rakhmanov-Saff numbers, Mathematics(all), Numerical Analysis, Approximation by polynomials, recurrence coefficients, Applied Mathematics, exponential weights, Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis, orthogonal polynomials, Analysis

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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
Average
Average
hybrid