Timeline for What's a great christmas present for someone with a PhD in Mathematics?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Dec 14, 2020 at 18:55 | comment | added | Nuclear Hoagie | @StevenGubkin I've never held these, but I imagine you'd still feel it as you roll over an "edge" - constant width does not imply that the center of mass is at the geometric center, so you could still have differently stable positions depending on the orientation. The top right image, for example, looks like it's sitting stably on its base, but would fall stably to the bottom right image if tipped far enough over the "edge", so I think you'd feel it behave differently as you rotate it. I'm also very curious for hands-on experience. | |
| Dec 12, 2020 at 17:03 | comment | added | Gil Kalai | The nice thing is to put a book on three of them and see how it stays stable and parallel to the floor. When I got the gift it did not work for me because I missed one of the solids in the box and tried it on two. | |
| Dec 12, 2020 at 14:24 | comment | added | Steven Gubkin | I imagine these feel very nice to roll around in your hand together. I imagine that you don't really have a sensation of one rolling over the "edge" of the other because of the constant width? I would be very curious to play with these. | |
| S Dec 12, 2020 at 6:20 | history | answered | Gil Kalai | CC BY-SA 4.0 | |
| S Dec 12, 2020 at 6:20 | history | made wiki | Post Made Community Wiki by Gil Kalai |