Closures.thy
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
2011-07-31 urbanc some experiments with the proofs in Myhill_2
2011-07-25 urbanc made the theories compatible with the existing developments in the AFP; old theories are in the directory Attic
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