Tue, 26 Jun 2007 15:48:09 +0200 paulson changes for type class ring_no_zero_divisors
Tue, 26 Jun 2007 13:02:28 +0200 nipkow *** empty log message ***
Tue, 26 Jun 2007 13:01:48 +0200 nipkow added NBE
Tue, 26 Jun 2007 08:42:04 +0200 nipkow removed removed lemmas
Tue, 26 Jun 2007 00:35:14 +0200 wenzelm fixed undo: try undos_proof first!
Mon, 25 Jun 2007 22:46:55 +0200 wenzelm tactics: more robust addressing of subgoal using (C)SUBGOAL/THEN_ALL_NEW;
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