Wed, 30 Dec 2015 21:56:12 +0100 wenzelm more symbols;
Wed, 30 Dec 2015 21:52:00 +0100 wenzelm more symbols;
Wed, 30 Dec 2015 21:35:21 +0100 wenzelm more symbols;
Wed, 30 Dec 2015 21:23:38 +0100 wenzelm clarified print modes;
Wed, 30 Dec 2015 21:10:19 +0100 wenzelm updated print modes;
Wed, 30 Dec 2015 21:05:15 +0100 wenzelm modernized Isabelle document markup;
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