Timeline for Proofs without words
Current License: CC BY-SA 2.5
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 5, 2010 at 20:23 | comment | added | Sean Tilson | isnt this also showing about $\eta^2$? or rather $lim\pi_{n+1}(S^n)$? | |
| Dec 15, 2009 at 5:58 | comment | added | David Lehavi | @Herald: thanks - thats the one I wanted. @David E. becasue for both of them you need a movie (and I didn't mennage to verbaly describe the SO_3 proof which Herald did). | |
| Dec 15, 2009 at 2:42 | comment | added | Harrison Brown | It doesn't feature Feynman, but here's a video of a human doing the plate trick (just after 1 minute in): youtube.com/watch?v=CYBqIRM8GiY | |
| Dec 15, 2009 at 0:00 | comment | added | Mariano Suárez-Álvarez | @David: well, you can think if this answer (or of Harald's comment, which gets my emphatic upvote) as a script for the choreography which, when acted out, is a proof without words :P | |
| Dec 14, 2009 at 23:07 | comment | added | David Eppstein | Why are there so many words and so few pictures in this answer? | |
| Dec 14, 2009 at 21:44 | comment | added | Dan Piponi | David, it's not the one I wanted either :-) I wanted to find a video of Feynman himself doing the plate trick but there doesn't seem to be one online. | |
| Dec 14, 2009 at 21:21 | comment | added | Harald Hanche-Olsen | Place a glass on the open palm of your hand. You can, with a bit of practice, rotate the glass twice (but not once) around the vertical axis without spilling any liquid from it, and return to your original position. Each part of your body goes through a loop in SO_3. Moving from the shoulder via the arm to the glass, you get a homotopy essentially proving the theorem. I have seen dancers from somewhere in south-east Asia incorporating this move into their dance. | |
| Dec 14, 2009 at 20:27 | comment | added | David Lehavi | Indeed, but it's not the one I wanted.... | |
| Dec 14, 2009 at 15:29 | comment | added | Dan Piponi | For SO(3) has order 2 element: gregegan.customer.netspace.net.au/APPLETS/21/21.html | |
| Dec 14, 2009 at 7:05 | history | answered | David Lehavi | CC BY-SA 2.5 |