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The asymptotic expansion of the Humbert hyper-Bessel function (2202.02049v1)

Published 4 Feb 2022 in math.CA

Abstract: We consider the asymptotic expansion of the Humbert hyper-Bessel function expressed in terms of a ${}0F_2$ hypergeometric function by [J{m,n}(x)=\frac{(x/3){m+n}}{m! n!}\,{}_0F_2(-!!!-;m+1, n+1; -(x/3)3)] as $x\to+\infty$, where $m$, $n$ are not necessarily non-negative integers. Particular attention is paid to the determination of the exponentially small contribution. The main approach utilised is that described by the author (J. Comput. Appl. Math. {\bf 234} (2010) 488-504); a leading-order estimate is also obtained by application of the saddle-point method applied to an integral representation containing a Bessel function. Numerical results are presented to demonstrate the accuracy of the resulting compound expansion.

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