1998-12-02 paulson new theorems Domain_Union, Range_Union
1998-12-01 wenzelm removed duplicate contrapos;
1998-12-01 wenzelm enum: !!! after seperator;
1998-12-01 wenzelm excursion: ERROR_MESSAGE;
1998-12-01 wenzelm qed: kind_name (again);
1998-12-01 wenzelm show_tags flag;
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