Sat, 01 Apr 2017 19:17:15 +0200 wenzelm clarified YXML vs. symbol encoding: operate on whole message;
Sat, 01 Apr 2017 19:16:19 +0200 wenzelm tuned proofs;
Sat, 01 Apr 2017 18:50:26 +0200 wenzelm misc tuning and modernization;
Sat, 01 Apr 2017 15:35:32 +0200 wenzelm tuned signature;
Sat, 01 Apr 2017 08:05:40 +0200 nipkow tuned
Fri, 31 Mar 2017 17:21:36 +0200 nipkow more lemmas
Thu, 23 Mar 2017 17:20:47 +0100 wenzelm tuned proof;
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