Wed, 07 Apr 2010 17:37:29 +0200 | Christian Urban | added an induction principle for permutations; removed add_perm construction | changeset | files |
Tue, 06 Apr 2010 23:33:40 +0200 | Christian Urban | isarfied proof about existence of a permutation list | changeset | files |
Tue, 06 Apr 2010 14:08:06 +0200 | Christian Urban | added reference to E. Gunter's work | changeset | files |