Abstract

We provide a full asymptotic analysis of the N?rlund polynomials and Stirling polynomials. We give a general asymptotic expansion-to any desired degree of accuracy-when the parameter is not an integer. We use singularity analysis, Hankel contours, and transfer theory. This investigation was motivated by a need for such a complete asymptotic description, with parameter 1/2, during this author's recent solution of Wilf's 3rd (previously) Unsolved Problem.

Highlights

  • The Norlund polynomials have been studied in many contexts

  • Many connections have been identified with Bernoulli and Stirling numbers; see, e.g., [2], [3], [5], [6]

  • One feature of the following singularity analysis is the contrast between the structure of (B(z))α when α is an integer versus a non-integer

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Summary

BACKGROUND

The Norlund polynomials have been studied in many contexts. They were introduced by Norlund [10]. Don Knuth wrote to the author recently [8] (upon seeing an abstract of the author’s talk based on a preprint of this paper), urging the use of Stirling polynomials σn(x) as described on page 272 of [7]: zez ez − 1 x. With this definition, we associate Norlund and Stirling polynomials by the identity bnα n!. Because of the extensive use of the Bernoulli numbers in the Euler-MacLaurin formula and in many other asymptotic expansions, it is natural to investigate the asymptotic properties of the Norlund and Stirling polynomials, when α is fixed, and as n → ∞

MOTIVATION
MAIN RESULTS
PROOF OF REMARK 1
PROOF OF THEOREM 2
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