Happy PI day

14-03-2011 16:47:54 CET Postato in: nerdate | Commenta

$$ \pi = \sum_{k = 0}^{\infty}\frac{1}{16^k} \left(\frac{4}{8k + 1} - \frac{2}{8k + 4} - \frac{1}{8k + 5} - \frac{1}{8k + 6}\right) $$

Happy PI day, everyone!