Timeline for Nonconvex manhole covers
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 12, 2014 at 22:17 | comment | added | André Henriques | This is not convincing. Removing a "thin" strip is similar to chopping a "small" piece from a circle: it's enough to make the manhole fall into the hole. | |
| Jul 22, 2010 at 19:26 | comment | added | Richard Dore | an annulus is not a polygon. | |
| Jul 22, 2010 at 10:40 | history | answered | Stephen Miller | CC BY-SA 2.5 |