Sun, 20 May 2007 17:30:21 +0200 huffman add lemma power2_eq_imp_eq
Sun, 20 May 2007 13:39:46 +0200 urbanc added lemma for permutations on strings
Sun, 20 May 2007 10:13:06 +0200 huffman moved sqrt lemmas from Transcendental.thy to NthRoot.thy
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