Fri, 26 Sep 1997 10:21:14 +0200 paulson Minor tidying to use Clarify_tac, etc.
Fri, 26 Sep 1997 10:12:04 +0200 wenzelm eliminated rules;
Thu, 25 Sep 1997 13:25:50 +0200 paulson Clarify_tac and some textual improvements
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