Mon, 16 Apr 2012 12:54:08 +0000 urbanc polished
Mon, 16 Apr 2012 08:48:20 +0000 zhang The result for "Set" operation gets strengthened.
Sun, 15 Apr 2012 21:53:12 +0000 urbanc added some of the comments of the reviewers and made it compile with current Isabelle
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