| Sun, 04 Sep 2011 00:21:41 +0000 | urbanc | removed the last two sorry's | file | diff | annotate |
| Fri, 02 Sep 2011 09:53:56 +0000 | urbanc | cleaned up proofs | file | diff | annotate |
| Thu, 01 Sep 2011 23:18:34 +0000 | urbanc | included Higman's lemma from the Isabelle repository | file | diff | annotate |