Sat, 08 Jan 2011 16:01:51 +0100 wenzelm modernized structure Prop_Logic;
Sat, 08 Jan 2011 14:32:55 +0100 wenzelm added Context_Position.is_visible_proof, which treats a global theory as invisible (unlike the default);
Sat, 08 Jan 2011 14:30:54 +0100 wenzelm tuned;
Sat, 08 Jan 2011 00:28:31 +0100 wenzelm tuned;
Sat, 08 Jan 2011 00:02:11 +0100 wenzelm tuned headers;
Fri, 07 Jan 2011 23:46:06 +0100 wenzelm merged
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