Timeline for The rain hull and the rain ridge
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 11, 2011 at 21:06 | comment | added | Joseph O'Rourke | Yes, exactly, Joel, you've nailed it: I had falsely imagined a certain dynamism which is not present in the static "rain hull." | |
| Jul 11, 2011 at 18:00 | comment | added | Joel David Hamkins | Perhaps you could get computation if you allowed some kind of fluid friction in tiny tubes, which enabled pressure to build up, eventually exceeding a threshold that would then lead to siphon effects draining out large reservoirs. Or perhaps if you add capillary effects. I can imagine building switches that way. But without that kind of thing, it seems that the current formulation is monotone enough (we only add more blue pixels in the simulation) to allow the simulation to succeed. | |
| Jul 11, 2011 at 17:34 | comment | added | Joseph O'Rourke | I believe you are correct, Joel! I had thought perhaps some logic gadgets could be constructed, which would be a first step toward a 3SAT proof, but I no longer think such gates are possible. I think the issue with $n$ can be resolved. | |
| Jul 11, 2011 at 14:55 | history | answered | Joel David Hamkins | CC BY-SA 3.0 |