View source for Leibniz series

{{MSC|40A05}}
{{TEX|done}}

The alternating series
\begin{equation}
1-\frac13+\frac15-\frac17+\dots,
\end{equation}
which converges to $\pi/4$. It was considered by G. Leibniz in 1673–1674.

====References====
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|valign="top"|{{Ref|Kn}}|| K. Knopp,   "Theorie und Anwendung der unendlichen Reihen" , Springer  (1964)  (English translation: Blackie, 1951 &amp; Dover, reprint, 1990)
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