Featuring Professor Sylvain Cappell from NYU. Extra footage at:    • Colouring Knots (extra) - Numberphile  
More links & stuff in full description below ↓↓↓

Merch based on this video: https://teespring.com/numberphile-knots
And here: https://teespring.com/numberphile-fig...

Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile

We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outr...

And support from Math For America - https://www.mathforamerica.org/

NUMBERPHILE
Website: http://www.numberphile.com/
Numberphile on Facebook:   / numberphile  
Numberphile tweets:   / numberphile  
Subscribe: http://bit.ly/Numberphile_Sub

Video by Brady Haran and Pete McPartlan

Patreon:   / numberphile  

Numberphile T-Shirts and Merch: https://teespring.com/stores/numberphile

Brady's videos subreddit:   / bradyharan  

Brady's latest videos across all channels: http://www.bradyharanblog.com/

Sign up for (occasional) emails: http://eepurl.com/YdjL9