Xu Cui

LaTex support (2020)

I used to use jsMath to support latex in this website, but it no longer works (I have no idea why). The one I...
Xu Cui
When I was in high school and saw the following equation, my mind was blown! $$1+\frac{1}{4}+\frac{1}{9}+\frac{1}{16}+…=\frac{\pi^2}{6}$$ Why is Pi here? Isn’t it supposed to...