Wed, 29 Dec 1993 10:14:58 +0100 wenzelm added sys_error;
Wed, 22 Dec 1993 19:01:27 +0100 clasohm fixed a bug in update/next_level which occured when a child wasn't loaded
Tue, 21 Dec 1993 16:40:01 +0100 nipkow added empty type-abbr field to extend_theory
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