Sat, 26 May 2018 16:52:03 +0200 wenzelm clarified cache;
Sat, 26 May 2018 13:36:28 +0200 wenzelm tuned signature;
Sat, 26 May 2018 13:34:44 +0200 wenzelm tuned output;
Sat, 26 May 2018 10:11:11 +0100 paulson merged
Sat, 26 May 2018 08:36:19 +0100 paulson merged
Sat, 26 May 2018 08:36:09 +0100 paulson tidied some proofs
Thu, 24 May 2018 23:05:28 +0100 paulson merged
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