Wed, 16 Dec 2015 16:31:36 +0100 wenzelm rule_attribute and declaration_attribute implicitly support abstract closure, but mixed_attribute implementations need to be aware of Thm.is_free_dummy;
Tue, 15 Dec 2015 16:57:10 +0100 wenzelm tuned signature -- clarified modules;
Tue, 15 Dec 2015 16:01:57 +0100 wenzelm unused;
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