| 2011-02-17 | urbanc | completed first direction | file | diff | annotate |
| 2011-02-16 | urbanc | minor updated | file | diff | annotate |
| 2011-02-16 | urbanc | filled details in one place | file | diff | annotate |
| 2011-02-15 | urbanc | updated paper | file | diff | annotate |
| 2011-02-15 | urbanc | updated paper | file | diff | annotate |
| 2011-02-15 | urbanc | updated paper | file | diff | annotate |
| 2011-02-14 | urbanc | updated | file | diff | annotate |
| 2011-02-14 | urbanc | updated paper | file | diff | annotate |
| 2011-02-14 | urbanc | updated | file | diff | annotate |
| 2011-02-13 | zhang | More into the second direction | file | diff | annotate |
| 2011-02-11 | urbanc | included comments by Xingyuan | file | diff | annotate |
| 2011-02-11 | urbanc | slightly streamlined the proof | file | diff | annotate |
| 2011-02-10 | urbanc | simplified a bit the proof | file | diff | annotate |
| 2011-02-10 | urbanc | more things | file | diff | annotate |