Fri, 13 May 2011 16:03:03 +0200 wenzelm do not open ML structures;
Fri, 13 May 2011 15:55:32 +0200 wenzelm eliminated weight_ASTAR: int Unsynchronized.ref (astar_tac appears to be obsolete anyway);
Fri, 13 May 2011 15:47:54 +0200 wenzelm misc tuning and simplification;
Fri, 13 May 2011 14:39:55 +0200 wenzelm tuned proof;
Fri, 13 May 2011 14:26:51 +0200 wenzelm tuned proof;
Fri, 13 May 2011 14:25:35 +0200 wenzelm proper method_setup;
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