Derivatives.thy
2011-07-31 urbanc some experiments with the proofs in Myhill_2
2011-07-28 urbanc added a picture
2011-07-28 urbanc small improvements
2011-07-26 urbanc more on the section about derivatives
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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