Abstract
Many authors have proved results deducing an asymptotic expansion of for large from the behaviour of f(t), when f(t) is regular in an appropriate part of the complex t-plane. For example, if, for some k > 0 and some Am, αm for all large such that R(t) > C, then, as ⃗ ∞ in a suitable sector in the z-plane, we have where Z is an appropriate value of z1/z.

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