Mon, 10 May 2010 14:55:04 +0200 haftmann moved int induction lemma to theory Int as int_bidirectional_induct
Mon, 10 May 2010 14:18:41 +0200 haftmann tuned theory text; dropped unused lemma
Mon, 10 May 2010 14:11:50 +0200 haftmann one structure is better than three
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