Sun, 24 Apr 2016 21:31:14 +0200 wenzelm added Isar command 'define';
Sun, 24 Apr 2016 20:37:24 +0200 wenzelm within a proof body context, undeclared frees are like global constants;
Sun, 24 Apr 2016 20:29:49 +0200 wenzelm clarified modules;
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