The main purpose of this note is to gather as many distinct proofs as possible for the below equation

\[\large \zeta (2)=1 + \dfrac1{2^2 } + \dfrac1{3^2} + \dfrac1{4^2} + \cdots = \dfrac { { \pi }^{ 2 } }{ 6 } \]

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## Comments

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TopNewestI don't mean to be a party pooper but there are already plenty of proofs here.

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oh wow!

thanks for the link,i only know 2 lol

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What are your favorite proofs? Mine is still the classic \(\sin x = x(x\pm \pi)(x\pm 2\pi) \cdots \).

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i recently saw one that uses \(\frac { 1 }{ { k }^{ 2 } } =\displaystyle\int _{ 0 }^{ 1 }{ \displaystyle\int _{ 0 }^{ 1 }{ (xy)^{ k-1 }dxdy } } \) and really liked it too

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