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Mathematics  2009 

Using known zeta-series to derive the Dancs-He series for $\,\ln{2}\,$ and $\,ζ{(2\,n+1)}$

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Abstract:

In a recent work, Dancs and He found new `Euler-type' formulas for $\,\ln{2}\,$ and $\,\zeta{(2\,n+1)}$, $\,n\,$ being a positive integer, each containing a series that apparently can not be evaluated in closed form, distinctly from $\,\zeta{(2\,n)}$, for which the Euler's formula allows us to write it as a rational multiple of $\,\pi^{2n}$. There in that work, however, the formulas are derived through certain series manipulations, by following Tsumura's strategy, which makes it \emph{curious} --- in the words of those authors themselves --- the appearance of the numbers $\,\ln{2}\,$ and $\,\zeta{(2\,n+1)}$. In this short paper, I show how some known zeta-series can be used to derive the Dancs-He series in an alternative manner.

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