Tue, 03 Apr 2012 14:09:37 +0200 huffman add floor/ceiling lemmas suggested by René Thiemann
Tue, 03 Apr 2012 08:55:06 +0200 nipkow made sure that " is shown in tutorial text
Mon, 02 Apr 2012 21:26:46 +0100 Christian Urban merged
Mon, 02 Apr 2012 21:26:07 +0100 Christian Urban tuned proofs
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