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New asymptotic expansion for the Gamma function

  • Eötvös Loránd University

Research output: Contribution to journalArticlepeer-review

Abstract

Using a series transformation, the Stirling-De Moivre asymptotic series approximation to the Gamma function is converted into a new one with better convergence properties. The new formula is being compared with those of Stirling, Laplace, and Ramanujan for real arguments greater than 0.5 and turns out to be, for equal number of "correction" terms, numerically superior to all of them. As a side benefit, a closed-form approximation has turned up during the analysis which is about as good as 3rd order Stirling's (maximum relative error smaller than 1e - 10 for real arguments greater or equal to 24).

Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalArchiv der Mathematik
Volume95
Issue number2
DOIs
StatePublished - 2010
Externally publishedYes

Keywords

  • Asymptotic approximations
  • Asymptotic expansions
  • Gamma function
  • Stirling's formula

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