Sun, 30 Jan 2011 16:59:57 +0000 urbanc revised proof of Ardens lemma
Sun, 30 Jan 2011 12:22:07 +0000 zhang Illustration added together with renewed explainations for case STAR.
Sat, 29 Jan 2011 11:41:17 +0000 zhang Myhill.thy and Myhill_1.thy changed.
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