12:15

an aesthetic double sum

21:28

All of the details -- for the Calculus students out there!!!

18:00

I really like this sum!

21:21

A nice integral.

28:47

So many factorials!!!

1:05:09

Aula Final de Álgebra Linear 18.06 de Gil Strang

25:57

Putnam Exam 2004 | B5

16:59

This infinite series is crazy!