LerchPhiClassical[z, s, a] \[Proportional] LerchPhiClassical[z, s, Subscript[a, 0]] - s LerchPhiClassical[z, 1 + s, Subscript[a, 0]] (a - Subscript[a, 0]) + (1/2) s (1 + s) LerchPhiClassical[z, 2 + s, Subscript[a, 0]] (a - Subscript[a, 0])^2 + \[Ellipsis] /; (a -> Subscript[a, 0])

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2007-05-02