Wed, 21 Apr 2010 16:24:18 +0200 | Christian Urban | added a variant of the induction principle for permutations | file | diff | annotate |
Wed, 21 Apr 2010 12:37:19 +0200 | Christian Urban | added an improved version of the induction principle for permutations | file | diff | annotate |
Mon, 19 Apr 2010 09:25:31 +0200 | Christian Urban | tuned proofs | file | diff | annotate |