The rational numbers with addition form a group. The inverse function is taking the opposite.
*)
-inline procedural "cic:/CoRN/model/groups/Qgroup/Q_is_CGroup.con".
+inline procedural "cic:/CoRN/model/groups/Qgroup/Q_is_CGroup.con" as lemma.
-inline procedural "cic:/CoRN/model/groups/Qgroup/Q_as_CGroup.con".
+inline procedural "cic:/CoRN/model/groups/Qgroup/Q_as_CGroup.con" as definition.