nLab
Whitehead link

The Whitehead link is a famous link which shows the difference between the notion of equivalence. If links are only allowed to move by isotopies, then the two components are linked. However, if a link is allowed to pass through itself, then they can be unlinked.

Note

To include this picture in a page, write [[!include Whitehead link - SVG]].

Revised on October 21, 2010 00:47:19 by Toby Bartels (98.16.136.70)