Fri, 21 Sep 2018 17:48:39 +0200 wenzelm clarified errors;
Fri, 21 Sep 2018 16:47:03 +0200 wenzelm suppress some theories to allow "isabelle dump -o skip_proofs";
Fri, 21 Sep 2018 14:31:07 +0200 wenzelm tuned signature;
Thu, 20 Sep 2018 23:05:18 +0200 wenzelm merged
Thu, 20 Sep 2018 22:39:39 +0200 wenzelm clarified standardization of variables, with proper treatment of local variables;
Thu, 20 Sep 2018 18:20:02 +0100 paulson removal of more redundancies, and fixes
Thu, 20 Sep 2018 14:18:11 +0100 paulson merged
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