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- W2951107007 abstract "The coefficients that appear in uniform asymptotic expansions for integrals are typically very complicated. In the existing literature the majority of the work only give the first two coefficients. In a limited number of papers where more coefficients are given the evaluation of the coefficients near the coalescence points is normally highly numerically unstable. In this paper, we illustrate how well-known Cauchy type integral representations can be used to compute the coefficients in a very stable and efficient manner. We discuss the cases: (i) two coalescing saddles, (ii) two saddles coalesce with two branch points, (iii) a saddle point near an endpoint of the interval of integration. As a special case of (ii) we give a new uniform asymptotic expansion for Jacobi polynomials $P_n^{(alpha,beta)}(z)$ in terms of Laguerre polynomials $L_n^{(alpha)}(x)$ as $ntoinfty$ that holds uniformly for $z$ near $1$. Several numerical illustrations are included." @default.
- W2951107007 created "2019-06-27" @default.
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- W2951107007 date "2016-10-14" @default.
- W2951107007 modified "2023-09-27" @default.
- W2951107007 title "Computation of the coefficients appearing in the uniform asymptotic expansions of integrals" @default.
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