Thu, 16 Oct 1997 15:23:25 +0200 paulson New simprule diff_le_self, requiring a new proof of diff_diff_cancel
Thu, 16 Oct 1997 15:09:08 +0200 nipkow Removed comment.
Thu, 16 Oct 1997 14:52:35 +0200 wenzelm tuned;
Thu, 16 Oct 1997 14:48:10 +0200 wenzelm removed begin;
Thu, 16 Oct 1997 14:46:55 +0200 wenzelm fixed prep_ext;
Thu, 16 Oct 1997 14:14:01 +0200 nipkow Simplified proof.
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