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Possible Duplicate:
Different methods to compute $\sum_{n=1}^\infty \frac{1}{n^2}$.

$\sum \frac{1}{n^2}= \frac{\pi^2}{6}$

There are a few proofs for that fact but can anybody see why is it "really" true? Talking in geometric terms for example.

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    @Mitch: by the OP's own admission it sounds like the previous thread answered his question, more or less. The OP is free to edit or re-ask the question and describe what is not satisfactory about the proofs in the other thread.2011-05-20

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