LerchPhi
 Usage
• LerchPhi[z, s, a] 给出Lerch超越函数  .
Notes
•  , 其中  的项被排除。 • LerchPhi[z, s, a, DoublyInfinite->True] 给出和式  . • LerchPhi 是Zeta和PolyLog的推广。 • 参见 Mathematica 全书 : 节 3.2.10.
 Further Examples
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Here we use the option  .
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LerchPhi satisfies an analog to the functional equation for the Zeta function.
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The definitions of the invariants  and  in terms of the half-periods  and  exclude a particular term. Similarly, Mathematica allows you to choose whether or not to include the singular term (if there is one) in the series for Zeta[s, a] and LerchPhi[z, s, a].
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If there is no singular term the option has no effect.
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This is a series expansion around  .
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