Sun, 01 Oct 2006 03:07:12 +0200 huffman generalize more DERIV proofs
Sat, 30 Sep 2006 21:39:31 +0200 wenzelm statement: Variable.fix_frees;
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;
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