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====== Math 445 lecture 10: more ''for'' ====== Here's a in finite series for $pi^2/6$ \begin{eqnarray*} \frac{\pi^2}{6} = 1 + \frac{1}{2^2} + \frac{1}{3^2} + \frac{1}{4^2} + \frac{1}{5^2} + \ldots \end{eqnarray*}