Wed, 27 Aug 2008 20:36:23 +0200 wenzelm replaced find_substring by first_field;
Wed, 27 Aug 2008 17:54:31 +0200 ballarin Consistent naming of theorems in interpretation.
Wed, 27 Aug 2008 16:32:48 +0200 wenzelm simplified parse_attrib (find_substring instead of space_explode);
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