src/HOL/Isar_Examples/Group_Notepad.thy
Tue, 07 Oct 2014 20:59:46 +0200 wenzelm more cartouches;
Fri, 21 Feb 2014 18:23:11 +0100 wenzelm more symbols;
Tue, 03 Apr 2012 16:53:32 +0200 wenzelm some context examples;
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