The Four 4s

Featuring Tadashi Tokieda.More Tadashi videos: http://bit.ly/tadashi_vidsNumberphile is supported by the Mathematical Sciences Research Institute (MSRI): htt...

It was a famous problem for many years - until a physics genius solved it all the way to infinity.

Featuring author Alex Bellos.

Extras from this interview: https://youtu.be/jv8dITbiheQ

More Numberphile videos with Alex: http://bit.ly/Bellos_Playlist