Thu, 29 Sep 2005 00:59:02 +0200 wenzelm tuned default operation: use internal modify;
Thu, 29 Sep 2005 00:59:01 +0200 wenzelm abstract_rule: tuned exception msgs;
Thu, 29 Sep 2005 00:59:00 +0200 wenzelm back to simple 'defs' (cf. revision 1.79 of theory.ML);
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