Wed, 24 Jul 2019 11:32:18 +0200 wenzelm clarified modules;
Wed, 24 Jul 2019 10:49:01 +0200 wenzelm avoid global syntax for MinProof (amending e31271559de8);
Tue, 23 Jul 2019 23:10:22 +0200 wenzelm treat MinProof like Promise before 725438ceae7c, e.g. relevant for performance of session Corec (due to Thm.derivation_closed/close_derivation);
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