Closures.thy
2011-08-23 urbanc beginnig of the slides (not yet finished)
2011-08-22 urbanc changes according to afp-submission
2011-08-17 urbanc added an example for non-regularity and continuation lemma (the example does not yet work)
2011-08-11 urbanc finished section about derivatives and closure properties
2011-08-11 urbanc slight polishing
2011-08-09 urbanc more on paper
2011-08-05 urbanc more on the derivatives section
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