The discrete analogue of Laplace’s method
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We give a justification of the discrete analogue of Laplace’s method applied to the asymptotic estimation of sums consisting of positive terms. The case considered is the series related to the hypergeometric function pFq−1(x) (with q≥p+1) as x→+∞ discussed by Stokes [G.G. Stokes, Note on the determination of arbitrary constants which appear as multipliers of semi-convergent series, Proc. Camb. Phil. Soc. 6 (1889) 362–366]. Two examples are given in which it is shown how higher order terms in the asymptotic expansion may be derived by this procedure.
Paris, R.B. The discrete analogue of Laplace’s method. Computers & Mathematics with Applications. 61(10): pp.3024-3034. Available from http://dx.doi.org/10.1016/j.camwa.2011.03.092