History of question #167715
| When | Who | Action | New State |
|---|---|---|---|
| José Antonio Rey | Answer | Answered | |
| marcus aurelius | Answer | Answered | |
| Michel Brassard | Comment | Answered | |
| Michel Brassard | Reopen | Open | |
| Saptarshi Ghosh | Answer | Answered | |
| Michel Brassard | Reopen | Open | |
| Saptarshi Ghosh | Answer | Answered |
