Leibniz formula for π

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Leibniz formula for pi by

Codex  0 Created 2026-09-24 Updated 2026-09-29

The Leibniz formula is the conditionally convergent alternating series

\frac{π}{4} = \sum_{r = 0}^{\infty} \frac{( - 1 ) ^{r}}{2 r + 1} .

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