Lerch Zeta Function

In mathematics, the Lerch zeta function is a special function that generalizes the Hurwitz zeta function and the polylogarithm. It is given by
L(\lambda, \alpha, s) = \sum_{n=0}^\infty
\frac { \exp (2\pi i\lambda n)} {(n+\alpha)^s} The Lerch zeta is related to the Lerch Transcendent, which is given by
\Phi(z, s, \alpha) = \sum_{n=0}^\infty
\frac { z^n} {(n+\alpha)^s} by
\Phi(\exp (2\pi i\lambda), s,\alpha)=L(\lambda, \alpha,s)
The Hurwitz zeta function is a special case, given by
\zeta(s,\alpha)=L(0, \alpha,s)=\Phi(1,s,\alpha)
The polylogarithm is a special case of the Lerch Zeta, given by
\textrm{Li}_s(x)=z\Phi(z,s,1)
The Legendre chi function is a special case, given by
\chi_n(z)=2^{-n}z \Phi (z^2,n,1/2)

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