18:00

I really like this sum!

28:47

So many factorials!!!

24:20

Too hard for the IMO? Too easy?

59:46

∫ A playlist when math starts to get serious ∫

23:51

Por Que esse Número Está em Todo Canto?

14:30

This is always even??

15:11

a floor equation.

16:59

This infinite series is crazy!