Constructive Approximation

, Volume 14, Issue 1, pp 113–150 | Cite as

Uniform Asymptotic Expansions for Meixner Polynomials

  • X. -S. Jin
  • R. Wong


Meixner polynomials m n (x;β,c) form a postive-definite orthogonal system on the positive real line x > 0 with respect to a distribution step function whose jumps are \(j(x;\beta,c) = \frac{c^x(\beta)_x}{x!} \qquad \mbox{at}\quad x=0,1,2\ldots.\) Unlike classical orthogonal polynomials, they do not satisfy a second-order linear differential equation. In this paper, we derive two infinite asymptotic expansions for m n (nα;β,c) as \(n\to\infty\) . One holds uniformly for \(0 < \epsilon\le \alpha\le 1+a\) , and the other holds uniformly for \(1-b\le \alpha\le M < \infty\) , where a and b are two small positive quantities. Both expansions involve the parabolic cylinder function and its derivative. Our results include all five asymptotic formulas recently given by W. M. Y. Goh as special cases.

Key words. Meixner polynomials  Uniform asymptotic expansions, Steepest descent method  Parabolic cylinder function. AMS Classification.  Primary 41A60, 33C45.  <lsiheader> <onlinepub>8 May, 1998  <editor>Editors-in-Chief: &lsilt;a href=../edboard.html#chiefs&lsigt;R.A. DeVore  E.B. Saff&lsilt;/a&lsigt; <pdfname>14n1p113.pdf <pdfexist>yes <htmlexist>no <htmlfexist>no <texexist>yes <sectionname> </lsiheader> 


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Copyright information

© Springer-Verlag New York 1997

Authors and Affiliations

  • X. -S. Jin
    • 1
  • R. Wong
    • 2
  1. 1.Department of Mathematics University of Manitoba Winnipeg Canada, R3T 2N2CA
  2. 2.Department of Mathematics City University of Hong Kong Tat Chee Avenue Kowloon Hong KongHK

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