Exponentially small expansions of the Wright function on the Stokes lines

Richard B. Paris

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    10 Citations (Scopus)
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    We investigate a particular aspect of the asymptotic expansion of the Wright function pΨq(z) for large |z|. In the case p = 1, q ⩾ 0, we establish the form of the exponentially small expansion of this function on certain rays in the z-plane (known as Stokes lines). The importance of such exponentially small terms is encountered in analytic probability theory and in the theory of generalised linear models. In addition, the transition of the Stokes multiplier connected with the subdominant exponential expansion across the Stokes lines is shown to obey the familiar error-function smoothing law expressed in terms of an appropriately scaled variable. Some numerical examples which confirm the accuracy of the expansion are given.
    Original languageEnglish
    Pages (from-to)82–105
    Number of pages24
    JournalLithuanian Mathematical Journal
    Issue number1
    Publication statusPublished - Jan 2014


    • 33C20
    • 33C70
    • 34E05
    • 41A60
    • Wright function
    • Stokes lines
    • Asymptotics
    • Exponentially small expansions


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