18:12

a combination of classic problem types

13:47

Hardy's Integral

14:48

a very aesthetic equation

14:32

thanks viewer for this nice limit!

9:10

finding the last two digits

38:31

Conjuntos abiertos de números reales - Vídeo de topología 1

12:39

these are the only perfect squares

17:39

the integral that Feynman('s trick) couldn't solve