Wed, 28 Mar 2012 12:08:08 +0200 wenzelm simplified statements and proofs;
Wed, 28 Mar 2012 11:46:14 +0200 wenzelm tuned whitespace;
Wed, 28 Mar 2012 11:17:32 +0200 wenzelm updated Sign.add_type, Name_Space.declare;
Wed, 28 Mar 2012 11:04:39 +0200 wenzelm updated comments;
Wed, 28 Mar 2012 08:25:51 +0200 huffman merged
Tue, 27 Mar 2012 22:10:26 +0200 huffman remove unnecessary rules from the simpset
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