Is the London Underground knotted?

Check out Geoff's video from the same day!
https://youtu.be/IIMbF_Amuc4
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.
https://www.youtube.com/watch?v=Qp2LDpJo-Ng

Henry and Sabetta also went and double-checked all of the overs and under in our knot.
https://www.youtube.com/watch?v=nJuODe8aVm0

Huge thanks to Sabetta and Henry. Here is the first video I made with them: Exploring Hyperbolic Space with VR
https://www.youtube.com/watch?v=MTfviv_aZYI
And my spherical camera video with Henry.
https://www.youtube.com/watch?v=x0gRcRd_rHs

Here is everyone's channel:
Vicki Pipe: https://www.youtube.com/user/VickiPipe/
Geoff Marshall: https://www.youtube.com/user/geofftech2
All the Stations: https://www.youtube.com/channel/UC7ttKX46nJxUeXZ0aoD4Q5g
Henry Segerman: https://www.youtube.com/user/henryseg

Worksheet and teaching resources to find your own underground knots!
https://www.think-maths.co.uk/standupmaths-videos?yt-tube#tube

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-london/
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:
https://www.patreon.com/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/

Видео Is the London Underground knotted? канала Stand-up Maths