| Sat, 22 Oct 2011 13:26:53 -0600 | Kevin Walker | add remarks about the missing TOP case; searched for all occurrances of "topological" and "continuous" to make sure all other mentions of TOP have been expunged; other minor changes | file | diff | annotate |
| Fri, 14 Oct 2011 08:35:15 -0700 | Kevin Walker | added some 'disk-like's in intro; other minor changes in intro; broke some lines | file | diff | annotate |