2011-01-26 zhang Small modification
2011-01-26 zhang ok
2011-01-25 zhang 1. Myhill.thy is proved to correct some typos. 2. Some sections are added to the first direction. 3. The small theory of list difference is now separated into Prefix_subtract.thy and the ROOT.ML
2011-01-24 zhang Directory [tphols-2011] is added to host the commented version of [Myhill.thy]. Directory [pres] is created to host a build session for logical image [ListP] which is essentially [Main] extended with [List_prefix.thy].
2011-01-07 wu Beautifying of the Other Direction is finished.
2010-12-31 wu Rewritten of hard direction once more. To make it looking better.
2010-12-14 wu Add new file for the new definition of the hard direction's simplification.
2010-11-26 urbanc added a recent paper by Tobias Nipkow on regular expressions
2010-11-26 urbanc added interesting paper by rutten
2010-11-25 urbanc added paper
2010-11-18 wu All cases of the Other direction finished
2010-11-10 urbanc added a test file
2010-11-10 urbanc my slides from the talk in Cambridge
2010-11-10 urbanc added my slides
2010-11-08 urbanc slight tuning of proof by Chunhan
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