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Can one let me know about the functional equation of the alternating zeta function similar to the well known for the rieman function.

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Since one has $$\sum_{n=1}^{\infty} \frac{(-1)^{n-1}}{n^s} = (1 -2^{1-s}) \zeta (s)$$ you get a Functional equation directly from the one for $\zeta$.

Note: This is function is also called Dirichlet eta function ; the linked Wikipedia page also has the equation spelled out.

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