Thu, 01 Aug 2019 09:55:37 +0200 wenzelm simplified module structure: back to plain datatype (see 95f4f08f950f and 70019ab5e57f);
Thu, 01 Aug 2019 09:50:20 +0200 wenzelm abstract type theory_id -- ensure non-equality type independently of implementation;
Wed, 31 Jul 2019 19:50:38 +0200 wenzelm clarified export: retain proof boxes as local definitions -- more scalable;
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