28 May
2014
28 May
'14
2:11 p.m.
Very nice! (I think it takes 8 tetrahedra to form a flexible ring like that if they are all *regular*, according to unpublished work of J. Gerver.) --Dan On May 28, 2014, at 12:43 PM, Fred Lunnon <fred.lunnon@gmail.com> wrote:
I have only just worked out (I think) what was meant by "swim through itself" here, reminding me of this animation of a 7-link rotating smoke-ring robot with just one nontrivial degree of freedom, which I don't recall having mentioned on math-fun before:
https://www.dropbox.com/s/aeo6rxtc5j4p291/sevenring.gif
Open in a browser for the animation to execute: it should do so in situ, with no need to downoad first.