Sun, 04 Sep 2011 06:27:59 -0700 huffman move lemmas nat_le_iff and nat_mono into Int.thy
Sun, 04 Sep 2011 19:36:19 +0200 wenzelm eliminated markup for plain identifiers (frequent but insignificant);
Sun, 04 Sep 2011 19:12:06 +0200 wenzelm simplified signatures;
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