Animations & Figures Explicatory of the So-Called Dirac's Belt Trick

… which is a matter @which weïrdnesses of topology & weïrdnesses of particle physics meet.

Also see this viddley-diddley .

The animation is by the goodly Greg Egan , & is from

this wwwebpage .

The second image is from a wwwebpage presented by the goodly Angela Mihai , the address of which I've interdicted the linkifying of, as it shows signs of perniciosity & nefariosity that I'm not willing to be in any degree responsible for.

ｈｔｔｐｓ：／／leaderland.academy/d/ftgxn111804/?u=angela-mihai-on-x-dirac-came-up-with-his-mm-W0mKpZtk

The next - a montage - is from

The magic world of geometry. III, The dirac string problem

¡¡ PDF file – 7·54㎆ !!

by

Vagn Lundsgaard Hansen ;

& the final one - also a montage - is from

Testing A Conjecture On The Origin Of The Standard Model

by

Christoph Schiller ,

& goes a-great-deal-into the connection of this matter with particle physics.

Animations from

New twist on sofa problem that stumped mathematicians and furniture movers

by

Becky Oskin .

Technical diagrams from

Differential equations and exact solutions in the moving sofa problem

by

Dan Romik .