age ~92
from Cleveland, OH
So we want to talk about euler characteristic. And betty. Number. For ...
Videos by Brady Haran Brady's videos subreddit: Brady's latest video...
I've got some good news and some bad news for you. The bad news is tha...
A description of planar graph duality, and how it can be applied in a ...
Eulers pioneering equation, the most beautiful equation in mathematics...