Mon, 26 Apr 2010 19:58:51 -0700 huffman remove unused, redundant constant inv_on
Mon, 26 Apr 2010 19:55:50 -0700 huffman reorganize subsection headings
Mon, 26 Apr 2010 17:56:39 -0700 huffman remove redundant lemma
Mon, 26 Apr 2010 16:28:58 -0700 huffman more lemmas to Vec1.thy
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