Sat, 30 Sep 2006 21:39:29 +0200 wenzelm added undo_end;
Sat, 30 Sep 2006 21:39:27 +0200 wenzelm tuned proofs;
Sat, 30 Sep 2006 21:39:25 +0200 wenzelm proper import of Main HOL;
Sat, 30 Sep 2006 21:39:24 +0200 wenzelm tuned specifications and proofs;
Sat, 30 Sep 2006 21:39:22 +0200 wenzelm hides popular names (from Datatype.thy);
Sat, 30 Sep 2006 21:39:20 +0200 wenzelm removed obsolete sum_case_Inl/Inr;
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