Wed, 07 Apr 2010 17:37:29 +0200 Christian Urban added an induction principle for permutations; removed add_perm construction
Tue, 06 Apr 2010 23:33:40 +0200 Christian Urban isarfied proof about existence of a permutation list
Tue, 06 Apr 2010 14:08:06 +0200 Christian Urban added reference to E. Gunter's work
(0) -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 tip