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

What is $\lim \limits_{n\to\infty} \sum\limits_{k=1}^n \frac{1}{k^2}$ as an exact value?

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    pi^2/6 due to Euler2011-04-20
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    http://en.wikipedia.org/wiki/Riemann_zeta_function#Specific_values2011-04-20
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    I suggest you to google 'Basel's problem'. Then you will get a numerous resource on it, including diverse proofs.2011-04-20
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    Don't miss Robin Chapman's collection of 14 proofs here: http://empslocal.ex.ac.uk/people/staff/rjchapma/etc/zeta2.pdf2011-04-20
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    Just because it's Xmas doesn't mean you can resurrect closed questions with pointless edits, Rahul!2011-12-25

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