# π, why do you pop up everywhere?

So, when I saw the following post from Saturday morning breakfast cereal,

I remembered proving that $\zeta(2)=\frac{\pi^2}{6}$ by using Fourier series. Curious as to how many other proofs exist, I searched around and found A LOT of them.

Check here and here. Some of them have really clever arguments. 😀

Advertisements