Wed, 04 Aug 2010 16:28:45 +0200 wenzelm uniform naming of imports (source specification) vs. parents (thy node names) vs. parent_thys (theory values);
Wed, 04 Aug 2010 16:11:51 +0200 wenzelm load_thy/after_load: explicit check of parent theories, which might have failed to join proofs -- avoid uninformative crash via Graph.UNDEF;
Wed, 04 Aug 2010 15:50:55 +0200 wenzelm export use_thys_wrt;
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