Wed, 21 Apr 2010 16:24:18 +0200 Christian Urban added a variant of the induction principle for permutations
Wed, 21 Apr 2010 13:39:34 +0200 Cezary Kaliszyk merge
Wed, 21 Apr 2010 13:38:37 +0200 Cezary Kaliszyk More about concat
(0) -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 tip