Timeline for Billiards with incompatible regions
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:58 | history | edited | CommunityBot |
replaced http://mathoverflow.net/ with https://mathoverflow.net/
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| Jan 31, 2011 at 8:04 | comment | added | Denis Serre | I don't pretend that Penrose's example is robust. But at least, you can perturb a square cul-de-sac in an arbitrary small way, and the incompatibility with the upper half remains valid. | |
| Jan 31, 2011 at 2:55 | history | asked | mjqxxxx | CC BY-SA 2.5 |