Fri, 20 Jun 2008 19:57:45 +0200 huffman add lemma Abs_image
Fri, 20 Jun 2008 18:03:01 +0200 huffman added some lemmas; reorganized into sections; tuned proofs
Fri, 20 Jun 2008 18:00:55 +0200 huffman added some lemmas; tuned proofs
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