Is the London Underground knotted?

Check out Geoff's video from the same day!
   • Видео  
Thanks very much to Vicki and Geoff for all their help.

If you want some more maths, and the 'rules' for finding a Tube Knot, check out the bonus content video on my second channel.
   • Bonus video: knot rules  

Henry and Sabetta also went and double-checked all of the overs and under in our knot.
   • Checking the overs and unders of a knot on...  

Huge thanks to Sabetta and Henry. Here is the first video I made with them: Exploring Hyperbolic Space with VR
   • Exploring Hyperbolic Space with VR (and cr...  
And my spherical camera video with Henry.
   • The maths of spherical video (aka "360 cam...  

Here is everyone's channel:
Vicki Pipe:    / vickipipe  
Geoff Marshall:    / geofftech2  
All the Stations:    / @allthestations  
Henry Segerman:    / henryseg  

Worksheet and teaching resources to find your own underground knots!
https://www.think-maths.co.uk/standup...

Here are the detailed "Carto Metro" maps you can use to check which line goes under/over which.
http://carto.metro.free.fr/metro-tram...


CORRECTIONS
At 13:19 I call Green Park "West Park" when talking about going west. First noticed by Geoff Marshall, of course.
Let me know if you or Geoff spot anything else!


Thanks as always for Jane Street being my principal sponsor.
https://www.janestreet.com/

Thanks to my Patreon supporters who help make these videos possible. Here is a random subset:

Deanv Crouch
Brandon Bisel
Claire Greenhalgh
Vojtěch Mělnický
Gary Martin
Nelson Emerson

Support my channel and I can make more maths videos:
  / standupmaths  

Filming by Matt Parker and Geoff Marshall
Editing by Michelle Martin
Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
Maths book: http://wwwh.umble-pi.com
Nerdy maths toys: http://mathsgear.co.uk/