Sat, 04 Feb 2017 19:10:12 +0100 wenzelm tuned;
Fri, 03 Feb 2017 23:24:45 +0100 wenzelm proper background certificate from make_context, which can be a super-theory of the direct join (amending d07464875dd4);
Fri, 03 Feb 2017 16:36:44 +0100 wenzelm misc tuning;
Thu, 02 Feb 2017 09:55:16 -0500 hoelzl move mono_neutral_cong from AFP/Deep_Learning/PP_Auxiliary
Thu, 02 Feb 2017 14:42:06 +0100 blanchet added veriT preprocessing proof reconstruction example
Thu, 02 Feb 2017 09:32:11 +0100 nipkow tuned proof
Wed, 01 Feb 2017 21:09:47 +0100 nipkow renaming
Wed, 01 Feb 2017 17:36:24 +0100 nipkow added is_empty
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