Wed, 02 Aug 2006 22:26:40 +0200 wenzelm simplified Assumption/ProofContext.export;
Wed, 02 Aug 2006 22:26:39 +0200 wenzelm replaced obsolete standard/freeze_all by Variable.trade;
Wed, 02 Aug 2006 22:26:37 +0200 wenzelm removed obsolete Drule.frees/vars_of etc.;
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