English

A uniform asymptotic expansion for the incomplete gamma functions revisited

Classical Analysis and ODEs 2016-11-03 v1

Abstract

A new uniform asymptotic expansion for the incomplete gamma function Γ(a,z)\Gamma(a,z) valid for large values of zz was given by the author in {\it J. Comput. Appl. Math.} {\bf 148} (2002) 323--339. This expansion contains a complementary error function of an argument measuring transition across the point z=az=a, with easily computable coefficients that do not involve a removable singularity in the neighbourhood of this point. In this note we correct a misprint in the listing of certain coefficients in this expansion and discuss in more detail the situation corresponding to Γ(a,a)\Gamma(a,a).

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Cite

@article{arxiv.1611.00548,
  title  = {A uniform asymptotic expansion for the incomplete gamma functions revisited},
  author = {R B Paris},
  journal= {arXiv preprint arXiv:1611.00548},
  year   = {2016}
}

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9 pages