Tue, 27 Aug 2002 11:06:45 +0200 wenzelm simplified results;
Tue, 27 Aug 2002 11:06:20 +0200 wenzelm Thm.proof_of;
Tue, 27 Aug 2002 11:06:07 +0200 wenzelm check_goal: produce error instead of warning;
Tue, 27 Aug 2002 11:05:31 +0200 wenzelm added proof_of;
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